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# 代码审查报告
**文件:** `data\demo-pmd\src\com\demo\designep\DesignErrorProne.java`
**语言:** java
**耗时:** 195.1s
**分析工具:** pmd
---
总计: 771 | 错误: 166 | 警告: 598 | 建议: 7
静态分析 · 762 个问题
- 🔴 `pmd:AbstractClassWithoutAnyMethod` L30
抽象类没有抽象方法，abstract 可能只是用来阻止实例化
建议: 如果目的是阻止实例化，应使用私有或 protected 构造函数而非 abstract。
- 🔴 `pmd:SystemPrintln` L39
使用了 System.out/err 输出
建议: 改用 SLF4J/Log4j 等日志框架记录输出。
- 🔴 `pmd:AvoidThrowingNullPointerException` L75
避免手动抛出 NullPointerException
建议: 应通过参数校验、Objects.requireNonNull 等方式处理，而不是直接 new NullPointerException。
- 🔴 `pmd:AvoidThrowingRawExceptionTypes` L82
避免抛出原始异常类型 RuntimeException
建议: 抛出自定义异常或更具体的异常类型，并携带业务上下文。
- 🔴 `pmd:ClassWithOnlyPrivateConstructorsShouldBeFinal` L93
只有私有构造函数，应声明为 final
建议: 给类添加 final 修饰符，防止通过反射或内部类扩展。
- 🔴 `pmd:SystemPrintln` L103
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L140
Usage of System.out/err
- 🔴 `pmd:FieldNamingConventions` L149
字段命名不符合约定
建议: 按 Java 命名规范：常量用 UPPER_SNAKE，普通字段用 lowerCamel。
- 🔴 `pmd:SystemPrintln` L155
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L158
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L161
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- 🔴 `pmd:SystemPrintln` L164
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- 🔴 `pmd:SystemPrintln` L167
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- 🔴 `pmd:SystemPrintln` L170
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- 🔴 `pmd:SystemPrintln` L173
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- 🔴 `pmd:SystemPrintln` L176
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- 🔴 `pmd:SystemPrintln` L179
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- 🔴 `pmd:SystemPrintln` L185
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- 🔴 `pmd:SystemPrintln` L188
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- 🔴 `pmd:SystemPrintln` L191
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- 🔴 `pmd:SystemPrintln` L194
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- 🔴 `pmd:SystemPrintln` L197
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- 🔴 `pmd:SystemPrintln` L200
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- 🔴 `pmd:SystemPrintln` L203
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- 🔴 `pmd:SystemPrintln` L206
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- 🔴 `pmd:SystemPrintln` L209
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- 🔴 `pmd:SystemPrintln` L215
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- 🔴 `pmd:SystemPrintln` L218
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- 🔴 `pmd:SystemPrintln` L224
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- 🔴 `pmd:SystemPrintln` L257
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- 🔴 `pmd:SystemPrintln` L299
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- 🔴 `pmd:SystemPrintln` L422
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- 🔴 `pmd:SystemPrintln` L423
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- 🔴 `pmd:SystemPrintln` L424
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- 🔴 `pmd:SystemPrintln` L425
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- 🔴 `pmd:SystemPrintln` L426
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- 🔴 `pmd:SystemPrintln` L428
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- 🔴 `pmd:SystemPrintln` L429
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- 🔴 `pmd:SystemPrintln` L430
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- 🔴 `pmd:SystemPrintln` L431
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- 🔴 `pmd:SystemPrintln` L432
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- 🔴 `pmd:SystemPrintln` L436
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- 🔴 `pmd:SystemPrintln` L438
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- 🔴 `pmd:SystemPrintln` L439
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- 🔴 `pmd:SystemPrintln` L440
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- 🔴 `pmd:SystemPrintln` L441
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- 🔴 `pmd:SystemPrintln` L442
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- 🔴 `pmd:SystemPrintln` L443
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- 🔴 `pmd:SystemPrintln` L444
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- 🔴 `pmd:SystemPrintln` L445
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- 🔴 `pmd:SystemPrintln` L446
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- 🔴 `pmd:SystemPrintln` L450
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- 🔴 `pmd:SystemPrintln` L464
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- 🔴 `pmd:SystemPrintln` L495
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- 🔴 `pmd:SystemPrintln` L498
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- 🔴 `pmd:SystemPrintln` L501
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- 🔴 `pmd:SystemPrintln` L502
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- 🔴 `pmd:SystemPrintln` L503
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- 🔴 `pmd:SystemPrintln` L504
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- 🔴 `pmd:SystemPrintln` L507
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- 🔴 `pmd:SystemPrintln` L508
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- 🔴 `pmd:SystemPrintln` L509
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- 🔴 `pmd:SystemPrintln` L510
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- 🔴 `pmd:SystemPrintln` L514
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- 🔴 `pmd:SystemPrintln` L515
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- 🔴 `pmd:SystemPrintln` L516
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- 🔴 `pmd:SystemPrintln` L528
Usage of System.out/err
- 🔴 `pmd:AvoidReassigningParameters` L538
避免重新为参数赋值
建议: 使用新的局部变量保存修改后的值。
- 🔴 `pmd:SystemPrintln` L539
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L577
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- 🔴 `pmd:SystemPrintln` L578
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- 🔴 `pmd:SystemPrintln` L586
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- 🔴 `pmd:SystemPrintln` L597
Usage of System.out/err
- 🔴 `pmd:ConstructorCallsOverridableMethod` L693
构造函数中调用了可重写方法
建议: 避免在构造期间调用非 final/method，或将该方法设为 final/private。
- 🔴 `pmd:DoNotCallGarbageCollectionExplicitly` L702
不要显式触发垃圾回收
建议: 删除 System.gc()，交由 JVM 自动管理内存。
- 🔴 `pmd:AvoidThrowingRawExceptionTypes` L728
Avoid throwing raw exception type RuntimeException.
- 🔴 `pmd:EqualsNull` L758
避免使用 equals() 与 null 比较
建议: 使用 o == null 判空，而不是 o.equals(null)。
- 🔴 `pmd:AvoidReassigningParameters` L766
Avoid reassigning parameters such as 's'
- 🔴 `pmd:SystemPrintln` L768
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L788
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L790
Usage of System.out/err
- 🔴 `pmd:MethodNamingConventions` L816
方法命名不符合约定
建议: 使用 lowerCamelCase 命名方法，如 sameName()。
- 🔴 `pmd:ClassWithOnlyPrivateConstructorsShouldBeFinal` L829
This class has only private constructors and may be final
- 🔴 `pmd:MoreThanOneLogger` L835
类中包含多个 logger
建议: 统一使用一个 logger 实例，避免日志输出混乱。
- 🔴 `pmd:SystemPrintln` L843
Usage of System.out/err
- 🔴 `pmd:ReturnEmptyCollectionRatherThanNull` L882
应返回空集合而不是 null
建议: 返回 Collections.emptyList() 或 List.of()。
- 🔴 `pmd:SuspiciousEqualsMethodName` L909
方法名与 equals(Object) 高度相似，容易误导
建议: 重命名方法，或改为真正重写 equals(Object)。
- 🔴 `pmd:SystemPrintln` L928
Usage of System.out/err
- 🔴 `pmd:FieldNamingConventions` L996
The field name 'TypeName' doesn't match '[a-z][a-zA-Z0-9]*'
- 🔴 `pmd:SingleMethodSingleton` L1029
类包含多个 getInstance 方法，单例模式混乱
建议: 只保留一个无参 getInstance()，移除重载方法。
- 🔴 `pmd:ClassWithOnlyPrivateConstructorsShouldBeFinal` L1029
This class has only private constructors and may be final
- 🔴 `pmd:SingletonClassReturningNewInstance` L1039
getInstance 总是创建新对象，不符合单例行为
建议: getInstance 应返回缓存的唯一实例，而不是新建对象。
- 🔴 `pmd:SystemPrintln` L1070
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L1078
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L1089
Usage of System.out/err
- 🔴 `pmd:FieldNamingConventions` L1096
The constant name '_LOG' doesn't match '[A-Z][A-Z_0-9]*'
- 🔴 `pmd:GuardLogStatement` L1101
日志调用应使用日志级别守卫包裹
建议: 添加 if (LOGGER.isDebugEnabled()) 等守卫，或使用占位符避免字符串拼接。
- 🔴 `pmd:SystemPrintln` L1134
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L1178
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L1208
Usage of System.out/err
- 🔴 `pmd:SystemPrintln` L1218
Usage of System.out/err
- 🔴 `pmd:AvoidBranchingStatementAsLastInLoop` L1222
避免在循环末尾使用 break/continue 作为最后一条语句
建议: 调整循环结构，使正常退出条件更明确。
- 🔴 `pmd:AvoidMultipleUnaryOperators` L1230
多个一元运算符叠用可能造成误解或 bug
建议: 简化表达式，只保留一个运算符或使用括号明确语义。
- 🔴 `pmd:AvoidMultipleUnaryOperators` L1231
Using multiple unary operators may be a bug, and/or is confusing.
- 🔴 `pmd:SystemPrintln` L1232
Usage of System.out/err
- 🔴 `pmd:BrokenNullCheck` L1239
null 检查逻辑有误，可能导致 NullPointerException 或逻辑错误
建议: 检查短路语义：判空应使用 && 或 || 正确组合，并在空值分支避免解引用。
- 🔴 `pmd:BrokenNullCheck` L1242
Dereferencing the qualifier of this expression will throw a NullPointerException
- 🔴 `pmd:ProperCloneImplementation` L1254
clone() 应通过 super.clone() 实现
建议: 使用 super.clone() 并强制转换返回类型，而不是 new 新对象。
- 🔴 `pmd:ProperCloneImplementation` L1286
Object clone() should be implemented with super.clone()
- 🔴 `pmd:FieldNamingConventions` L1339
The field name 'LOG' doesn't match '[a-z][a-zA-Z0-9]*'
- 🔴 `pmd:FieldNamingConventions` L1344
The constant name '_LOG' doesn't match '[A-Z][A-Z_0-9]*'
- 🔴 `pmd:ClassWithOnlyPrivateConstructorsShouldBeFinal` L1372
This class has only private constructors and may be final
- 🔴 `pmd:FieldNamingConventions` L1373
The static field name 'INSTANCE' doesn't match '[a-z][a-zA-Z0-9]*'
- 🔴 `pmd:ClassWithOnlyPrivateConstructorsShouldBeFinal` L1384
This class has only private constructors and may be final
- 🔴 `pmd:FieldNamingConventions` L1385
The static field name 'INSTANCE' doesn't match '[a-z][a-zA-Z0-9]*'
- 🔴 `pmd:SystemPrintln` L1400
Usage of System.out/err
- 🟡 `pmd:AtLeastOneConstructor` L30
每个类应至少声明一个构造函数（适用于所有命中项）
建议: 为没有构造函数的类添加显式构造函数；若类不应被实例化，则改为私有构造。
- 🟡 `pmd:AbstractClassWithoutAbstractMethod` L30
该抽象类没有任何抽象方法
建议: 删除 abstract 关键字，或为类增加抽象方法。
- 🟡 `pmd:AtLeastOneConstructor` L34
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L35
缺少默认访问修饰符的注释（方法/字段/类）
建议: 为包级私有成员添加 /* default */ 注释，或显式声明 private/protected/public。
- 🟡 `pmd:MethodArgumentCouldBeFinal` L35
参数未被赋值，可以声明为 final（适用于所有命中项）
建议: 在方法参数前添加 final 修饰符，避免无意中重新赋值。
- 🟡 `pmd:MethodArgumentCouldBeFinal` L35
Parameter 'b' is not assigned and could be declared final
- 🟡 `pmd:MethodArgumentCouldBeFinal` L35
Parameter 'c' is not assigned and could be declared final
- 🟡 `pmd:CollapsibleIfStatements` L37
该 if 语句可以与父级 if 合并
建议: 使用 && 或 || 将嵌套条件合并，减少嵌套层级。
- 🟡 `pmd:AvoidDeeplyNestedIfStmts` L38
if 嵌套过深，难以阅读
建议: 使用卫语句、提前返回或提取方法降低嵌套深度。
- 🟡 `pmd:CollapsibleIfStatements` L38
This if statement could be combined with its parent
- 🟡 `pmd:AtLeastOneConstructor` L47
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L48
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AvoidRethrowingException` L51
捕获异常后仅重新抛出，应避免
建议: 不要捕获该异常，直接在方法签名中声明抛出；若必须捕获，请加入实际处理逻辑。
- 🟡 `pmd:CommentDefaultAccessModifier` L55
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:AtLeastOneConstructor` L60
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L61
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:CommentDefaultAccessModifier` L68
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:AtLeastOneConstructor` L73
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L74
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AtLeastOneConstructor` L80
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L81
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AtLeastOneConstructor` L87
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L88
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AvoidUncheckedExceptionsInSignatures` L88
方法/构造函数不应显式声明非受检异常 RuntimeException
建议: 从 throws 子句中删除非受检异常。
- 🟡 `pmd:MissingStaticMethodInNonInstantiatableClass` L93
类无法实例化，且没有提供任何静态方法或字段
建议: 添加 public static 方法/工厂方法，或将类声明为 final 并仅作工具类使用。
- 🟡 `pmd:AtLeastOneConstructor` L99
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L100
Missing commented default access modifier on method 'bad(int, int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L100
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:MethodArgumentCouldBeFinal` L100
Parameter 'b' is not assigned and could be declared final
- 🟡 `pmd:CollapsibleIfStatements` L102
This if statement could be combined with its parent
- 🟡 `pmd:AtLeastOneConstructor` L110
Each class should declare at least one constructor
- 🟡 `pmd:DataClass` L110
类疑似数据类（只包含 getter/setter）
建议: 将数据与行为封装在一起，增加业务方法，避免仅作为数据容器。
- 🟡 `pmd:PublicMemberInNonPublicType` L113
非公共类型中声明了公共成员
建议: 将类改为 public，或将该成员的访问级别降为 package 私有。
- 🟡 `pmd:PublicMemberInNonPublicType` L116
Public member 'setName' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L116
Parameter 'name' is not assigned and could be declared final
- 🟡 `pmd:PublicMemberInNonPublicType` L119
Public member 'getAge' declared in a non-public type
- 🟡 `pmd:PublicMemberInNonPublicType` L122
Public member 'setAge' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L122
Parameter 'age' is not assigned and could be declared final
- 🟡 `pmd:MissingSerialVersionUID` L128
实现 Serializable 的类应定义 serialVersionUID
建议: 添加 private static final long serialVersionUID = 1L;
- 🟡 `pmd:AtLeastOneConstructor` L128
Each class should declare at least one constructor
- 🟡 `pmd:DoNotExtendJavaLangError` L128
异常不应继承 java.lang.Error
建议: 应继承 Exception/RuntimeException，Error 留给 JVM 内部严重错误。
- 🟡 `pmd:AtLeastOneConstructor` L132
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L133
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UnusedAssignment` L134
变量的初始值从未被使用
建议: 删除初始赋值，或直接使用最终需要的值初始化。
- 🟡 `pmd:CommentDefaultAccessModifier` L142
Missing commented default access modifier on method 'check()'
- 🟡 `pmd:AtLeastOneConstructor` L148
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L149
Missing commented default access modifier on field 'CONST'
- 🟡 `pmd:FinalFieldCouldBeStatic` L149
final 字段可以声明为 static
建议: 若字段是编译时常量，请声明为 static final。
- 🟡 `pmd:AtLeastOneConstructor` L153
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L154
Missing commented default access modifier on method 'm1(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L154
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L157
Missing commented default access modifier on method 'm2(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L157
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L160
Missing commented default access modifier on method 'm3(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L160
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L163
Missing commented default access modifier on method 'm4(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L163
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L166
Missing commented default access modifier on method 'm5(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L166
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L169
Missing commented default access modifier on method 'm6(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L169
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L172
Missing commented default access modifier on method 'm7(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L172
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L175
Missing commented default access modifier on method 'm8(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L175
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L178
Missing commented default access modifier on method 'm9(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L178
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L181
Missing commented default access modifier on method 'm10(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L181
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L184
Missing commented default access modifier on method 'm11(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L184
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L187
Missing commented default access modifier on method 'm12(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L187
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L190
Missing commented default access modifier on method 'm13(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L190
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L193
Missing commented default access modifier on method 'm14(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L193
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L196
Missing commented default access modifier on method 'm15(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L196
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L199
Missing commented default access modifier on method 'm16(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L199
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L202
Missing commented default access modifier on method 'm17(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L202
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L205
Missing commented default access modifier on method 'm18(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L205
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L208
Missing commented default access modifier on method 'm19(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L208
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L211
Missing commented default access modifier on method 'm20(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L211
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L214
Missing commented default access modifier on method 'm21(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L214
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L217
Missing commented default access modifier on method 'm22(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L217
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L220
Missing commented default access modifier on method 'm23(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L220
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L223
Missing commented default access modifier on method 'm24(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L223
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L226
Missing commented default access modifier on method 'm25(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L226
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L229
Missing commented default access modifier on method 'm26(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L229
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L232
Missing commented default access modifier on method 'm27(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L232
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L235
Missing commented default access modifier on method 'm28(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L235
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L238
Missing commented default access modifier on method 'm29(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L238
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L241
Missing commented default access modifier on method 'm30(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L241
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L244
Missing commented default access modifier on method 'm31(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L244
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L247
Missing commented default access modifier on method 'm32(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L247
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L250
Missing commented default access modifier on method 'm33(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L250
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L253
Missing commented default access modifier on method 'm34(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L253
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L256
Missing commented default access modifier on method 'm35(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L256
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L259
Missing commented default access modifier on method 'm36(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L259
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L262
Missing commented default access modifier on method 'm37(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L262
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L265
Missing commented default access modifier on method 'm38(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L265
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L268
Missing commented default access modifier on method 'm39(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L268
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L271
Missing commented default access modifier on method 'm40(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L271
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L274
Missing commented default access modifier on method 'm41(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L274
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L277
Missing commented default access modifier on method 'm42(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L277
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L280
Missing commented default access modifier on method 'm43(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L280
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L283
Missing commented default access modifier on method 'm44(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L283
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L286
Missing commented default access modifier on method 'm45(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L286
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L289
Missing commented default access modifier on method 'm46(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L289
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L292
Missing commented default access modifier on method 'm47(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L292
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L295
Missing commented default access modifier on method 'm48(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L295
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L298
Missing commented default access modifier on method 'm49(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L298
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:CommentDefaultAccessModifier` L301
Missing commented default access modifier on method 'm50(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L301
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:UnusedPrivateField` L308
存在未使用的私有字段
建议: 删除该字段，或确认其确实被需要后补充使用。
- 🟡 `pmd:ImmutableField` L308
字段可以声明为 final
建议: 初始化后不再变更的字段应添加 final 修饰符。
- 🟡 `pmd:UnnecessaryConstructor` L310
构造函数不必要，编译器会生成默认构造
建议: 删除空的、无实际逻辑的构造函数。
- 🟡 `pmd:CommentDefaultAccessModifier` L310
Missing commented default access modifier on constructor 'Immut()'
- 🟡 `pmd:AtLeastOneConstructor` L315
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L317
Public member 'getname' declared in a non-public type
- 🟡 `pmd:PublicMemberInNonPublicType` L320
Public member 'setname' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L320
Parameter 'n' is not assigned and could be declared final
- 🟡 `pmd:AtLeastOneConstructor` L326
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L327
Missing commented default access modifier on method 'bad(A)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L327
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:LawOfDemeter` L328
Call to `getB` on foreign value `a` (degree 1)
- 🟡 `pmd:AtLeastOneConstructor` L330
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L330
Missing commented default access modifier on nested class 'A'
- 🟡 `pmd:CommentDefaultAccessModifier` L331
Missing commented default access modifier on method 'getB()'
- 🟡 `pmd:AtLeastOneConstructor` L335
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L335
Missing commented default access modifier on nested class 'B'
- 🟡 `pmd:CommentDefaultAccessModifier` L336
Missing commented default access modifier on method 'getC()'
- 🟡 `pmd:AtLeastOneConstructor` L340
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L340
Missing commented default access modifier on nested class 'C'
- 🟡 `pmd:CommentDefaultAccessModifier` L341
Missing commented default access modifier on method 'doIt()'
- 🟡 `pmd:AtLeastOneConstructor` L347
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L348
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L348
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:SimplifyBooleanReturns` L349
该 if 语句可被替换为返回条件表达式
建议: 例如 if (x) return true; else return false 应改为 return x;
- 🟡 `pmd:LogicInversion` L349
Use opposite operator instead of the logic complement operator.
- 🟡 `pmd:OnlyOneReturn` L350
方法应只有唯一出口，且应在最后一条语句
建议: 将多个 return 改为单出口风格，或使用表达式结果返回。
- 🟡 `pmd:UseUtilityClass` L359
所有成员都是静态的，应添加私有构造防止实例化
建议: 为工具类添加 private 无参构造函数，并将类声明为 final。
- 🟡 `pmd:MutableStaticState` L360
不要使用非 final 非私有的静态字段
建议: 改为 private static final，或通过 getter/setter 控制访问。
- 🟡 `pmd:CommentDefaultAccessModifier` L360
Missing commented default access modifier on field 'counter'
- 🟡 `pmd:AtLeastOneConstructor` L364
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L365
Public member 'x' declared in a non-public type
- 🟡 `pmd:AtLeastOneConstructor` L369
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L370
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:SignatureDeclareThrowsException` L370
方法/构造函数不应显式抛出 java.lang.Exception
建议: 抛出具体异常类型，避免宽泛的 Exception。
- 🟡 `pmd:AtLeastOneConstructor` L375
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L376
Missing commented default access modifier on method 'bad(boolean)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L376
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:SimplifiedTernary` L377
三元表达式可以简化
建议: 例如 return x ? true : false 应改为 return x。
- 🟡 `pmd:AtLeastOneConstructor` L382
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L383
Missing commented default access modifier on method 'bad(boolean)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L383
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:SimplifyBooleanExpressions` L384
布尔表达式包含不必要的比较
建议: 例如 return x == true 应改为 return x。
- 🟡 `pmd:AtLeastOneConstructor` L389
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L390
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L390
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:SimplifyBooleanReturns` L391
This if statement can be replaced by `return {condition};`
- 🟡 `pmd:OnlyOneReturn` L392
A method should have only one exit point, and that should be the last statement in the method
- 🟡 `pmd:AtLeastOneConstructor` L400
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L401
Missing commented default access modifier on method 'bar(Object)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L401
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L402
存在空的控制语句（if/for/while 等）
建议: 补充逻辑或删除空语句块。
- 🟡 `pmd:SimplifyConditional` L402
instanceof 前不需要检查 null
建议: 删除 x != null &&，因为 x instanceof List 已覆盖 null 情况。
- 🟡 `pmd:AtLeastOneConstructor` L408
Each class should declare at least one constructor
- 🟡 `pmd:SingularField` L409
字段可能应改为局部变量
建议: 如果字段只在一个方法中使用，请改为方法内局部变量。
- 🟡 `pmd:PublicMemberInNonPublicType` L411
Public member 'foo' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L411
Parameter 'y' is not assigned and could be declared final
- 🟡 `pmd:AtLeastOneConstructor` L418
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L419
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L419
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:SwitchDensity` L420
switch 中语句与分支比例过高
建议: 将每个 case 的逻辑抽取为独立方法，或使用多态/映射表重构。
- 🟡 `pmd:AtLeastOneConstructor` L471
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L472
Missing commented default access modifier on method 'm()'
- 🟡 `pmd:AtLeastOneConstructor` L475
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L477
Missing commented default access modifier on method 'm()'
- 🟡 `pmd:UselessOverridingMethod` L477
重写方法仅调用 super，无实际用途
建议: 删除该重写方法，让父类方法直接生效。
- 🟡 `pmd:UseUtilityClass` L483
All members are static. Consider adding a private no-args constructor to prevent instantiation.
- 🟡 `pmd:CommentDefaultAccessModifier` L484
Missing commented default access modifier on method 'helper()'
- 🟡 `pmd:AtLeastOneConstructor` L491
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L492
Public member 'bar' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L492
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:AtLeastOneConstructor` L525
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L526
Missing commented default access modifier on method 'bar(Object, String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L526
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:MethodArgumentCouldBeFinal` L526
Parameter 'baz' is not assigned and could be declared final
- 🟡 `pmd:MisplacedNullCheck` L527
null 检查位置错误，可能引发 NullPointerException
建议: 先判空再调用方法，例如 a != null && a.equals(baz)。
- 🟡 `pmd:AtLeastOneConstructor` L536
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L537
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:AssignmentInOperand` L538
避免在操作数中赋值
建议: 将赋值移到表达式外，单独一行，再参与判断。
- 🟡 `pmd:UseUtilityClass` L545
All members are static. Consider adding a private no-args constructor to prevent instantiation.
- 🟡 `pmd:MutableStaticState` L546
Do not use non-final non-private static fields
- 🟡 `pmd:CommentDefaultAccessModifier` L546
Missing commented default access modifier on field 'counter'
- 🟡 `pmd:CommentDefaultAccessModifier` L548
Missing commented default access modifier on constructor 'AssignStatic()'
- 🟡 `pmd:AssignmentToNonFinalStatic` L549
构造函数中给非 final 静态字段赋值可能不安全
建议: 使用实例字段，或通过 static final/初始化块管理静态状态。
- 🟡 `pmd:AtLeastOneConstructor` L554
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L555
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:SignatureDeclareThrowsException` L555
A method/constructor should not explicitly throw java.lang.Exception
- 🟡 `pmd:LocalVariableCouldBeFinal` L556
局部变量可声明为 final
建议: 为只赋值一次的局部变量添加 final 修饰符。
- 🟡 `pmd:AvoidAccessibilityAlteration` L557
不应使用 setAccessible(true) 修改可见性
建议: 避免反射破坏封装；若必须，应评估安全风险并限制调用权限。
- 🟡 `pmd:AtLeastOneConstructor` L562
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L563
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:LocalVariableCouldBeFinal` L564
Local variable 'o' could be declared final
- 🟡 `pmd:AvoidCallingFinalize` L565
避免显式调用 finalize() 方法
建议: 删除显式调用，改用 try-with-resources 或 Cleaner 管理资源。
- 🟡 `pmd:AtLeastOneConstructor` L570
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L571
Missing commented default access modifier on field 'd'
- 🟡 `pmd:AvoidDecimalLiteralsInBigDecimalConstructor` L571
避免用浮点字面量构造 BigDecimal，可能产生精度问题
建议: 使用字符串构造：new BigDecimal("0.1")。
- 🟡 `pmd:AtLeastOneConstructor` L575
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L576
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AtLeastOneConstructor` L583
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L584
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L584
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:AvoidLiteralsInIfCondition` L585
if 条件中避免使用魔术数字/字面量
建议: 将 42、5 等常量提取为命名常量。
- 🟡 `pmd:AtLeastOneConstructor` L592
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L593
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AssignmentInOperand` L596
Avoid assignment to x in operand
- 🟡 `pmd:AtLeastOneConstructor` L602
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L603
Missing commented default access modifier on field 'x'
- 🟡 `pmd:AvoidUsingOctalValues` L603
避免使用八进制字面量
建议: 去掉前导 0，或明确使用 0x/0b 前缀。
- 🟡 `pmd:AtLeastOneConstructor` L607
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L608
Missing commented default access modifier on method 'bad(Object, Object)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L608
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:MethodArgumentCouldBeFinal` L608
Parameter 'b' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L609
Empty if statement
- 🟡 `pmd:AtLeastOneConstructor` L615
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L616
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UselessPureMethodCall` L618
调用了纯方法但未使用结果
建议: 删除该调用，或将结果赋给变量并使用。
- 🟡 `pmd:CommentDefaultAccessModifier` L620
Missing commented default access modifier on method 'doSomething()'
- 🟡 `pmd:AtLeastOneConstructor` L625
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L626
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UselessPureMethodCall` L627
Do not call pure method toString if the result is not used.
- 🟡 `pmd:CommentDefaultAccessModifier` L630
Missing commented default access modifier on method 'doSomething()'
- 🟡 `pmd:AtLeastOneConstructor` L635
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L636
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:CloseResource` L637
资源使用后应关闭
建议: 使用 try-with-resources 自动关闭 InputStream 等资源。
- 🟡 `pmd:LocalVariableCouldBeFinal` L637
Local variable 'in' could be declared final
- 🟡 `pmd:CheckSkipResult` L638
应检查 InputStream.skip() 的返回值
建议: 将 skip 返回值赋给变量，并判断是否满足所需跳过字节数。
- 🟡 `pmd:AtLeastOneConstructor` L643
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L644
Missing commented default access modifier on method 'bad(Collection<String>)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L644
Parameter 'c' is not assigned and could be declared final
- 🟡 `pmd:UnusedLocalVariable` L645
存在未使用的局部变量
建议: 删除未使用的局部变量，或补全其使用逻辑。
- 🟡 `pmd:ClassCastExceptionWithToArray` L645
Collection.toArray() 的使用会抛出 ClassCastException
建议: 使用 c.toArray(new String[0]) 传入类型化数组。
- 🟡 `pmd:AtLeastOneConstructor` L650
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L651
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:LocalVariableCouldBeFinal` L652
Local variable 'in' could be declared final
- 🟡 `pmd:AtLeastOneConstructor` L658
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L659
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UnusedLocalVariable` L660
Avoid unused local variables such as 'l'.
- 🟡 `pmd:UnusedLocalVariable` L661
Avoid unused local variables such as 'o'.
- 🟡 `pmd:PrimitiveWrapperInstantiation` L661
不要使用 new Integer(...)，应使用 Integer.valueOf(...)
建议: 使用装箱缓存或 Integer.valueOf 替代 new Integer。
- 🟡 `pmd:UnnecessaryBoxing` L661
存在不必要的显式装箱
建议: 直接使用基本类型或依赖自动装箱。
- 🟡 `pmd:AtLeastOneConstructor` L666
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L667
Missing commented default access modifier on method 'bad(String, String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L667
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:MethodArgumentCouldBeFinal` L667
Parameter 'b' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L668
Empty if statement
- 🟡 `pmd:CompareObjectsWithEquals` L668
比较对象引用应使用 equals() 而不是 ==
建议: 对非基本类型对象比较使用 equals()。
- 🟡 `pmd:UseEqualsToCompareStrings` L668
比较字符串应使用 equals() 而不是 ==
建议: 使用 a.equals(b)，并按需调用 equalsIgnoreCase。
- 🟡 `pmd:AtLeastOneConstructor` L674
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L675
Missing commented default access modifier on method 'bad(double)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L675
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L676
Empty if statement
- 🟡 `pmd:ComparisonWithNaN` L676
与 NaN 比较恒为 false
建议: 使用 Double.isNaN(x) 判断 NaN。
- 🟡 `pmd:AtLeastOneConstructor` L682
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L683
Missing commented default access modifier on method 'call()'
- 🟡 `pmd:CommentDefaultAccessModifier` L686
Missing commented default access modifier on method 'accept(String[])'
- 🟡 `pmd:CommentDefaultAccessModifier` L692
Missing commented default access modifier on constructor 'CtorCall()'
- 🟡 `pmd:CommentDefaultAccessModifier` L695
Missing commented default access modifier on method 'overridable()'
- 🟡 `pmd:AtLeastOneConstructor` L700
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L701
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:MissingSerialVersionUID` L707
Classes implementing Serializable should set a serialVersionUID
- 🟡 `pmd:AtLeastOneConstructor` L707
Each class should declare at least one constructor
- 🟡 `pmd:DoNotExtendJavaLangThrowable` L707
异常不应直接继承 java.lang.Throwable
建议: 应继承 Exception 或 RuntimeException。
- 🟡 `pmd:AtLeastOneConstructor` L711
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L712
Missing commented default access modifier on field 'path'
- 🟡 `pmd:DoNotHardCodeSDCard` L712
不要硬编码 /sdcard 路径
建议: 使用环境变量或上下文 API 获取存储路径。
- 🟡 `pmd:AtLeastOneConstructor` L716
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L717
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:DoNotTerminateVM` L718
不应调用 System.exit() 终止 JVM
建议: 通过受控方式结束应用，或抛出异常交给上层处理。
- 🟡 `pmd:AtLeastOneConstructor` L723
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L724
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:CommentDefaultAccessModifier` L731
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:AtLeastOneConstructor` L736
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L737
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:DontUseFloatTypeForLoopIndices` L738
不要使用浮点类型作为循环索引，浮点精度可能导致循环异常
建议: 改用 int/long 循环变量，或使用 double 并明确终止条件。
- 🟡 `pmd:EmptyControlStatement` L738
Empty for statement
- 🟡 `pmd:AtLeastOneConstructor` L744
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L745
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:EmptyCatchBlock` L748
避免空 catch 块
建议: 至少记录日志或做降级处理，不要静默吞掉异常。
- 🟡 `pmd:AvoidCatchingGenericException` L748
避免捕获泛化 Exception
建议: 捕获具体异常类型，如 IOException、IllegalArgumentException。
- 🟡 `pmd:CommentDefaultAccessModifier` L751
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:AtLeastOneConstructor` L756
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L757
Missing commented default access modifier on method 'bad(Object)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L757
Parameter 'o' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L758
Empty if statement
- 🟡 `pmd:AtLeastOneConstructor` L764
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L765
Missing commented default access modifier on method 'bad(String)'
- 🟡 `pmd:AtLeastOneConstructor` L773
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L774
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L774
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:IdenticalConditionalBranches` L775
条件分支完全相同，条件判断无意义
建议: 删除 if/else，直接返回相同结果或提取公共逻辑。
- 🟡 `pmd:OnlyOneReturn` L776
A method should have only one exit point, and that should be the last statement in the method
- 🟡 `pmd:AtLeastOneConstructor` L784
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L785
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L785
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:ImplicitSwitchFallThrough` L789
switch 分支存在隐式 fall-through
建议: 在 case 末尾补上 break/return，或添加注释明确故意 fall-through。
- 🟡 `pmd:AtLeastOneConstructor` L799
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L800
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UnusedLocalVariable` L801
Avoid unused local variables such as 'c'.
- 🟡 `pmd:PrimitiveWrapperInstantiation` L801
Do not use `new Integer(...)`, prefer `Integer.valueOf(...)`
- 🟡 `pmd:AtLeastOneConstructor` L806
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L807
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:ForLoopVariableCount` L808
for 循环中控制变量过多
建议: 拆分循环或将额外变量移到循环外，保持循环头简洁。
- 🟡 `pmd:AvoidReassigningLoopVariables` L809
避免修改循环控制变量
建议: 不要在循环体内或内层循环更新外层循环变量，使用独立变量。
- 🟡 `pmd:AtLeastOneConstructor` L815
Each class should declare at least one constructor
- 🟡 `pmd:MethodWithSameNameAsEnclosingClass` L816
方法与包含它的类同名（可能误当构造函数）
建议: 重命名方法，避免与类名混淆。
- 🟡 `pmd:CommentDefaultAccessModifier` L816
Missing commented default access modifier on method 'SameName()'
- 🟡 `pmd:AtLeastOneConstructor` L821
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L822
Missing commented default access modifier on method 'bad(String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L822
Parameter 's' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L823
Empty if statement
- 🟡 `pmd:MissingStaticMethodInNonInstantiatableClass` L829
Class cannot be instantiated and does not provide any static methods or fields
- 🟡 `pmd:UnusedPrivateField` L836
Avoid unused private fields such as 'LOG1'.
- 🟡 `pmd:UnusedPrivateField` L837
Avoid unused private fields such as 'LOG2'.
- 🟡 `pmd:AtLeastOneConstructor` L841
Each class should declare at least one constructor
- 🟡 `pmd:NonStaticInitializer` L842
非静态初始化器令人困惑
建议: 将初始化逻辑移到构造函数或工厂方法中。
- 🟡 `pmd:AtLeastOneConstructor` L848
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L849
Missing commented default access modifier on field 's'
- 🟡 `pmd:CommentDefaultAccessModifier` L850
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:NullAssignment` L851
将对象赋值为 null 是代码坏味道
建议: 用 Optional 或空集合/空对象模式替代 null 赋值。
- 🟡 `pmd:AtLeastOneConstructor` L856
Each class should declare at least one constructor
- 🟡 `pmd:OverrideBothEqualsAndHashcode` L857
重写 equals() 时应同时重写 hashCode()
建议: 为相等的对象保证 hashCode 一致，避免集合类行为异常。
- 🟡 `pmd:MissingOverride` L857
重写方法缺少 @Override 注解
建议: 在继承或实现的方法上添加 @Override 注解。
- 🟡 `pmd:AtLeastOneConstructor` L863
Each class should declare at least one constructor
- 🟡 `pmd:MissingOverride` L864
The method 'compareTo(CmpOnly)' is missing an @Override annotation.
- 🟡 `pmd:OverrideBothEqualsAndHashCodeOnComparable` L864
实现 Comparable 时应同时重写 equals() 和 hashCode()
建议: 保持 compareTo、equals、hashCode 三者语义一致。
- 🟡 `pmd:AtLeastOneConstructor` L870
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L871
Missing commented default access modifier on field 'c'
- 🟡 `pmd:ReplaceJavaUtilCalendar` L871
应使用 java.time 替代 java.util.Calendar
建议: 使用 LocalDate/LocalDateTime/ZonedDateTime 等新时间 API。
- 🟡 `pmd:AtLeastOneConstructor` L875
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L876
Missing commented default access modifier on field 'd'
- 🟡 `pmd:ReplaceJavaUtilDate` L876
应使用 java.time 替代 java.util.Date
建议: 使用 Instant/LocalDateTime 并配合 DateTimeFormatter 处理格式。
- 🟡 `pmd:ReplaceJavaUtilDate` L876
Usage of java.util.Date should be replaced with classes from java.time
- 🟡 `pmd:AtLeastOneConstructor` L880
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L881
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AtLeastOneConstructor` L887
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L888
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:OnlyOneReturn` L890
A method should have only one exit point, and that should be the last statement in the method
- 🟡 `pmd:ReturnFromFinallyBlock` L892
避免在 finally 块中返回值
建议: 从 try/catch 中返回结果，finally 只做资源清理。
- 🟡 `pmd:AtLeastOneConstructor` L898
Each class should declare at least one constructor
- 🟡 `pmd:AvoidFieldNameMatchingTypeName` L899
字段名与类名相同容易混淆
建议: 重命名字段，例如 sdf 改为 dateFormat。
- 🟡 `pmd:CommentDefaultAccessModifier` L899
Missing commented default access modifier on field 'sdf'
- 🟡 `pmd:SimpleDateFormatNeedsLocale` L899
SimpleDateFormat 实例化时应指定 Locale
建议: new SimpleDateFormat("yyyy-MM-dd", Locale.ROOT)。
- 🟡 `pmd:AtLeastOneConstructor` L903
Each class should declare at least one constructor
- 🟡 `pmd:AvoidStringBufferField` L904
StringBuffer 字段可能造成内存问题
建议: 优先使用 StringBuilder，并避免在长生命周期对象中持有大缓冲区。
- 🟡 `pmd:CommentDefaultAccessModifier` L904
Missing commented default access modifier on field 'sb'
- 🟡 `pmd:AtLeastOneConstructor` L908
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L909
Missing commented default access modifier on method 'equals(String)'
- 🟡 `pmd:AtLeastOneConstructor` L914
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L915
Missing commented default access modifier on method 'hashcode()'
- 🟡 `pmd:AtLeastOneConstructor` L920
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L921
Missing commented default access modifier on field 's'
- 🟡 `pmd:AtLeastOneConstructor` L925
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L926
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UnconditionalIfStatement` L927
不要使用恒真/恒假的 if 语句
建议: 删除无条件 if，直接执行其中的代码或删除整个语句块。
- 🟡 `pmd:AtLeastOneConstructor` L934
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L935
Missing commented default access modifier on method 'bad(String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L935
Parameter 's' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L936
Empty if statement
- 🟡 `pmd:AtLeastOneConstructor` L942
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L943
Missing commented default access modifier on method 'bad(int)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L943
Parameter 'x' is not assigned and could be declared final
- 🟡 `pmd:UnusedLocalVariable` L944
Avoid unused local variables such as 's'.
- 🟡 `pmd:UnnecessaryConversionTemporary` L944
避免不必要的临时转换对象
建议: 使用 String.valueOf(x) 替代 new Integer(x).toString()。
- 🟡 `pmd:PrimitiveWrapperInstantiation` L944
Do not use `new Integer(...)`, prefer `Integer.valueOf(...)`
- 🟡 `pmd:AtLeastOneConstructor` L949
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L950
Missing commented default access modifier on field 's'
- 🟡 `pmd:OverrideBothEqualsAndHashcode` L951
Ensure you override both equals() and hashCode()
- 🟡 `pmd:MissingOverride` L951
The method 'equals(Object)' is missing an @Override annotation.
- 🟡 `pmd:MethodArgumentCouldBeFinal` L951
Parameter 'o' is not assigned and could be declared final
- 🟡 `pmd:EmptyControlStatement` L952
Empty if statement
- 🟡 `pmd:AtLeastOneConstructor` L959
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L960
Missing commented default access modifier on method 'bad(String, String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L960
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:MethodArgumentCouldBeFinal` L960
Parameter 'b' is not assigned and could be declared final
- 🟡 `pmd:CompareObjectsWithEquals` L961
Use equals() to compare object references.
- 🟡 `pmd:UseEqualsToCompareStrings` L961
Use equals() to compare strings instead of '==' or '!='
- 🟡 `pmd:AtLeastOneConstructor` L966
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L967
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UselessPureMethodCall` L968
Do not call pure method length if the result is not used.
- 🟡 `pmd:AtLeastOneConstructor` L973
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L974
Missing commented default access modifier on method 'bad(String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L974
Parameter 's' is not assigned and could be declared final
- 🟡 `pmd:UselessPureMethodCall` L975
Do not call pure method toUpperCase if the result is not used.
- 🟡 `pmd:UseLocaleWithCaseConversions` L975
toUpperCase()/toLowerCase() 应指定 Locale
建议: 使用 s.toUpperCase(Locale.ROOT) 或指定业务 locale。
- 🟡 `pmd:AtLeastOneConstructor` L980
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L981
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:UnusedLocalVariable` L982
Avoid unused local variables such as 'cl'.
- 🟡 `pmd:UseProperClassLoader` L982
getClassLoader() 在 J2EE 中可能不符合预期
建议: 使用 Thread.currentThread().getContextClassLoader()。
- 🟡 `pmd:AtLeastOneConstructor` L987
Each class should declare at least one constructor
- 🟡 `pmd:AvoidFieldNameMatchingMethodName` L988
字段名与同名方法容易混淆
建议: 重命名字段或方法，避免同名歧义。
- 🟡 `pmd:CommentDefaultAccessModifier` L988
Missing commented default access modifier on field 'value'
- 🟡 `pmd:CommentDefaultAccessModifier` L990
Missing commented default access modifier on method 'value()'
- 🟡 `pmd:AtLeastOneConstructor` L995
Each class should declare at least one constructor
- 🟡 `pmd:AvoidFieldNameMatchingTypeName` L996
It is somewhat confusing to have a field name matching the declaring class name
- 🟡 `pmd:CommentDefaultAccessModifier` L996
Missing commented default access modifier on field 'TypeName'
- 🟡 `pmd:AtLeastOneConstructor` L1000
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1001
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AvoidCatchingGenericException` L1004
Avoid catching Exception in try-catch block
- 🟡 `pmd:EmptyControlStatement` L1005
Empty if statement
- 🟡 `pmd:AvoidInstanceofChecksInCatchClause` L1005
catch 块中不应使用 instanceof 判断异常类型
建议: 为每种异常类型增加独立的 catch 子句。
- 🟡 `pmd:CommentDefaultAccessModifier` L1009
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:AtLeastOneConstructor` L1014
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1015
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:LocalVariableCouldBeFinal` L1016
Local variable 'x' could be declared final
- 🟡 `pmd:TooFewBranchesForSwitch` L1017
switch 分支少于三个，使用 if 更高效
建议: 将 switch 改为 if/else if 判断。
- 🟡 `pmd:NonExhaustiveSwitch` L1017
switch 不完整，应包含 default 或所有枚举分支
建议: 补充 default 分支处理未知情况。
- 🟡 `pmd:NonCaseLabelInSwitch` L1020
switch 中出现了非 case 标签
建议: 移除标签，或重构 switch 逻辑。
- 🟡 `pmd:UnusedLabel` L1020
存在未使用的标签
建议: 删除未引用标签，避免误导。
- 🟡 `pmd:PublicMemberInNonPublicType` L1035
Public member 'getInstance' declared in a non-public type
- 🟡 `pmd:PublicMemberInNonPublicType` L1039
Public member 'getInstance' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L1039
Parameter 'obj' is not assigned and could be declared final
- 🟡 `pmd:VariableCanBeInlined` L1040
局部变量可以内联，不需要额外存储
建议: 直接返回值或表达式，减少中间变量。
- 🟡 `pmd:LocalVariableCouldBeFinal` L1040
Local variable 's' could be declared final
- 🟡 `pmd:SignatureDeclareThrowsException` L1047
A method/constructor should not explicitly throw java.lang.Exception
- 🟡 `pmd:UnsupportedJdkApiUsage` L1048
使用了不受支持的 JDK API（如 sun.misc.Unsafe）
建议: 改用标准 JDK API，例如 VarHandle/Atomic 类或通过受支持方式获取 Unsafe。
- 🟡 `pmd:AtLeastOneConstructor` L1053
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1054
Missing commented default access modifier on method 'bar()'
- 🟡 `pmd:IdempotentOperations` L1056
存在幂等操作（如变量赋值给自身/重复转换）
建议: 删除重复或自我赋值，保留一次有效操作。
- 🟡 `pmd:UnusedAssignment` L1056
The value assigned to variable 'x' is never used
- 🟡 `pmd:AtLeastOneConstructor` L1061
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L1062
Public member 'hashcode' declared in a non-public type
- 🟡 `pmd:SuspiciousHashcodeMethodName` L1062
方法名与 hashCode() 高度相似，但签名不符
建议: 重命名为 hashcode -> hashCode，并返回 int 且加上 @Override。
- 🟡 `pmd:AtLeastOneConstructor` L1068
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1069
Missing commented default access modifier on method 'foo()'
- 🟡 `pmd:SuspiciousOctalEscape` L1070
字符串中的八进制转义后紧跟数字字符很可疑
建议: 将转义拆分或改用 Unicode 转义，避免歧义。
- 🟡 `pmd:AtLeastOneConstructor` L1075
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1076
Missing commented default access modifier on method 'bad(String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L1076
Parameter 'buz' is not assigned and could be declared final
- 🟡 `pmd:LocalVariableCouldBeFinal` L1077
Local variable 'answer' could be declared final
- 🟡 `pmd:LiteralsFirstInComparisons` L1077
字符串比较时应将字面量放在前面
建议: 使用 "BAZ".equals(buz) 避免 NPE。
- 🟡 `pmd:UnnecessaryCaseChange` L1077
使用 toUpperCase/toLowerCase().equals() 不如 equalsIgnoreCase 清晰
建议: 改为 s1.equalsIgnoreCase(s2)。
- 🟡 `pmd:UseLocaleWithCaseConversions` L1077
When doing a String.toLowerCase()/toUpperCase() call, use a Locale
- 🟡 `pmd:AtLeastOneConstructor` L1083
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L1084
Public member 'method1' declared in a non-public type
- 🟡 `pmd:PublicMemberInNonPublicType` L1087
Public member 'method' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L1087
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:UnusedNullCheckInEquals` L1088
equals() 中的 null 检查未被使用或位置不当
建议: 直接调用非空对象.equals()，或先用 Objects.equals() 统一判空。
- 🟡 `pmd:AtLeastOneConstructor` L1095
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1097
Missing commented default access modifier on method 'bar()'
- 🟡 `pmd:AvoidCatchingGenericException` L1100
Avoid catching Exception in try-catch block
- 🟡 `pmd:CommentDefaultAccessModifier` L1104
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:AtLeastOneConstructor` L1109
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1111
Missing commented default access modifier on method 'bar()'
- 🟡 `pmd:AtLeastOneConstructor` L1118
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1119
Missing commented default access modifier on method 'bar()'
- 🟡 `pmd:AvoidDuplicateLiterals` L1120
字符串字面量重复出现多次
建议: 提取为常量，避免重复字符串字面量。
- 🟡 `pmd:CommentDefaultAccessModifier` L1125
Missing commented default access modifier on method 'buz(String)'
- 🟡 `pmd:AtLeastOneConstructor` L1130
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1131
Missing commented default access modifier on method 'foo()'
- 🟡 `pmd:JumbledIncrementer` L1133
内层循环修改了外层循环的递增变量，循环逻辑混乱
建议: 确保内层循环更新自己的控制变量，不要更新外层循环变量。
- 🟡 `pmd:LocalVariableCouldBeFinal` L1133
Local variable 'k' could be declared final
- 🟡 `pmd:AvoidReassigningLoopVariables` L1133
Avoid reassigning the loop control variable 'i'
- 🟡 `pmd:AtLeastOneConstructor` L1141
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1142
Missing commented default access modifier on method 'foo()'
- 🟡 `pmd:AvoidLiteralsInIfCondition` L1144
Avoid using literals such as 5 in if statements
- 🟡 `pmd:AtLeastOneConstructor` L1152
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1153
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:LocalVariableCouldBeFinal` L1154
Local variable 'numbers' could be declared final
- 🟡 `pmd:CollectionTypeMismatch` L1155
集合操作使用了与泛型类型不匹配的对象
建议: 确保存入/取出/删除的元素类型与泛型一致，例如用 Integer 而不是 String。
- 🟡 `pmd:UseConcurrentHashMap` L1156
并发访问场景应使用 ConcurrentHashMap
建议: 将 HashMap 改为 ConcurrentHashMap，或同步访问。
- 🟡 `pmd:LocalVariableCouldBeFinal` L1156
Local variable 'map' could be declared final
- 🟡 `pmd:UselessPureMethodCall` L1157
Do not call pure method get if the result is not used.
- 🟡 `pmd:CollectionTypeMismatch` L1157
Object of type 'int' cannot be in collection expecting 'java.lang.String'
- 🟡 `pmd:LocalVariableCouldBeFinal` L1158
Local variable 'names' could be declared final
- 🟡 `pmd:UselessPureMethodCall` L1159
Do not call pure method contains if the result is not used.
- 🟡 `pmd:CollectionTypeMismatch` L1159
Object of type 'int' cannot be in collection expecting 'java.lang.String'
- 🟡 `pmd:AtLeastOneConstructor` L1164
Each class should declare at least one constructor
- 🟡 `pmd:AtLeastOneConstructor` L1165
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1165
Missing commented default access modifier on nested class 'C'
- 🟡 `pmd:CommentDefaultAccessModifier` L1166
Missing commented default access modifier on method 'varargs(Object[])'
- 🟡 `pmd:CommentDefaultAccessModifier` L1167
Missing commented default access modifier on method 'call()'
- 🟡 `pmd:ConfusingArgumentToVarargsMethod` L1168
可变参数调用意图不清晰
建议: 显式转换为 Object 或 Object[]，或直接展开参数，避免歧义。
- 🟡 `pmd:ConfusingArgumentToVarargsMethod` L1169
Unclear if a varargs or non-varargs call is intended. Cast to Object or Object[] to clarify intent.
- 🟡 `pmd:AtLeastOneConstructor` L1175
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1176
Missing commented default access modifier on method 'bar(Object, String)'
- 🟡 `pmd:MethodArgumentCouldBeFinal` L1176
Parameter 'a' is not assigned and could be declared final
- 🟡 `pmd:MethodArgumentCouldBeFinal` L1176
Parameter 'baz' is not assigned and could be declared final
- 🟡 `pmd:AtLeastOneConstructor` L1184
Each class should declare at least one constructor
- 🟡 `pmd:UnusedPrivateField` L1186
Avoid unused private fields such as 'stream'.
- 🟡 `pmd:NonSerializableClass` L1186
可序列化类包含不可序列化的字段
建议: 将该字段标记为 transient，或改为可序列化类型。
- 🟡 `pmd:AtLeastOneConstructor` L1190
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1191
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:CommentDefaultAccessModifier` L1198
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:AtLeastOneConstructor` L1204
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1205
Missing commented default access modifier on method 'bad()'
- 🟡 `pmd:AtLeastOneConstructor` L1215
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1216
Missing commented default access modifier on method 'foo()'
- 🟡 `pmd:AvoidLiteralsInIfCondition` L1219
Avoid using literals such as 25 in if statements
- 🟡 `pmd:AtLeastOneConstructor` L1228
Each class should declare at least one constructor
- 🟡 `pmd:CommentDefaultAccessModifier` L1229
Missing commented default access modifier on method 'foo()'
- 🟡 `pmd:LocalVariableCouldBeFinal` L1230
Local variable 'i' could be declared final
- 🟡 `pmd:LocalVariableCouldBeFinal` L1231
Local variable 'b' could be declared final
- 🟡 `pmd:AtLeastOneConstructor` L1237
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L1238
Public member 'bar' declared in a non-public type
- 🟡 `pmd:MethodArgumentCouldBeFinal` L1238
Parameter 'string' is not assigned and could be declared final
- 🟡 `pmd:LiteralsFirstInComparisons` L1239
Position literals first in String comparisons
- 🟡 `pmd:OnlyOneReturn` L1240
A method should have only one exit point, and that should be the last statement in the method
- 🟡 `pmd:LiteralsFirstInComparisons` L1242
Position literals first in String comparisons
- 🟡 `pmd:OnlyOneReturn` L1243
A method should have only one exit point, and that should be the last statement in the method
- 🟡 `pmd:AtLeastOneConstructor` L1252
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L1254
Public member 'clone' declared in a non-public type
- 🟡 `pmd:CloneMethodReturnTypeMustMatchClassName` L1254
clone() 返回类型必须与类名一致
建议: 将 clone() 返回类型改为当前类名。
- 🟡 `pmd:CloneMethodMustImplementCloneable` L1254
只有实现 Cloneable 接口才应实现 clone() 方法
建议: 要么移除 clone() 方法，要么让类实现 Cloneable。
- 🟡 `pmd:AtLeastOneConstructor` L1260
Each class should declare at least one constructor
- 🟡 `pmd:CloneMethodReturnTypeMustMatchClassName` L1262
The return type of the clone() method must be the class name when implements Cloneable
- 🟡 `pmd:CloneMethodMustBePublic` L1262
实现 Cloneable 时 clone() 方法必须为 public
建议: 将 protected clone() 改为 public CloneableType clone()。
- 🟡 `pmd:OnlyOneReturn` L1264
A method should have only one exit point, and that should be the last statement in the method
- 🟡 `pmd:AtLeastOneConstructor` L1272
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L1274
Public member 'clone' declared in a non-public type
- 🟡 `pmd:CloneMethodReturnTypeMustMatchClassName` L1274
The return type of the clone() method must be the class name when implements Cloneable
- 🟡 `pmd:OnlyOneReturn` L1276
A method should have only one exit point, and that should be the last statement in the method
- 🟡 `pmd:AtLeastOneConstructor` L1284
Each class should declare at least one constructor
- 🟡 `pmd:PublicMemberInNonPublicType` L1286
Public member 'clone' declared in a non-public type
- 🟡 `pmd:CloneMethodReturnTypeMustMatchClassName` L1286
The return type of the clone() method must be the class name when implements Cloneable
- 🟡 `pmd:AtLeastOneConstructor` L1294
Each class should declare at least one constructor
- 🟡 `pmd:EmptyFinalizer` L1296
finalize() 方法为空，没有实际作用
建议: 删除空 finalize 方法，或使用 Cleaner 清理资源。
- 🟡 `pmd:AtLeastOneConstructor` L1301
Each class should declare at least one constructor
- 🟡 `pmd:FinalizeDoesNotCallSuperFinalize` L1304
finalize() 方法应最后调用 super.finalize()
建议: 在 finalize() 末尾添加 super.finalize()。
- 🟡 `pmd:CommentDefaultAccessModifier` L1306
Missing commented default access modifier on method 'cleanup()'
- 🟡 `pmd:AtLeastOneConstructor` L1311
Each class should declare at least one constructor
- 🟡 `pmd:FinalizeOnlyCallsSuperFinalize` L1313
finalize() 只调用 super.finalize()，没有实际清理逻辑
建议: 删除无意义的 finalize，或在其中加入真正的资源清理逻辑。
- 🟡 `pmd:AtLeastOneConstructor` L1319
Each class should declare at least one constructor
- 🟡 `pmd:FinalizeOnlyCallsSuperFinalize` L1320
Finalize should do something besides just calling super.finalize()
- 🟡 `pmd:MissingOverride` L1320
The method 'finalize()' is missing an @Override annotation.
- 🟡 `pmd:FinalizeOverloaded` L1323
finalize 方法不应被重载
建议: 删除重载的 finalize(int) 方法。
- 🟡 `pmd:AtLeastOneConstructor` L1328
Each class should declare at least one constructor
- 🟡 `pmd:FinalizeOnlyCallsSuperFinalize` L1330
Finalize should do something besides just calling super.finalize()
- 🟡 `pmd:FinalizeShouldBeProtected` L1330
finalize() 应声明为 protected
建议: 将 public finalize() 改为 protected finalize()。
- 🟡 `pmd:PublicMemberInNonPublicType` L1330
Public member 'finalize' declared in a non-public type
- 🟡 `pmd:AtLeastOneConstructor` L1338
Each class should declare at least one constructor
- 🟡 `pmd:ProperLogger` L1339
logger 应定义为 private static final，并持有正确的类
建议: 改为 private static final Logger LOG = LoggerFactory.getLogger(Class.class);
- 🟡 `pmd:AtLeastOneConstructor` L1343
Each class should declare at least one constructor
- 🟡 `pmd:ProperLogger` L1344
Logger should be defined private static final and have the correct class
- 🟡 `pmd:CommentDefaultAccessModifier` L1345
Missing commented default access modifier on method 'bar()'
- 🟡 `pmd:AvoidCatchingGenericException` L1348
Avoid catching Exception in try-catch block
- 🟡 `pmd:CommentDefaultAccessModifier` L1352
Missing commented default access modifier on method 'doWork()'
- 🟡 `pmd:MissingSerialVersionUID` L1359
Classes implementing Serializable should set a serialVersionUID
- 🟡 `pmd:AtLeastOneConstructor` L1359
Each class should declare at least one constructor
- 🟡 `pmd:UnusedPrivateField` L1360
Avoid unused private fields such as 'value'.
- 🟡 `pmd:AtLeastOneConstructor` L1364
Each class should declare at least one constructor
- 🟡 `pmd:UnusedPrivateField` L1366
Avoid unused private fields such as 'nonSerializableField'.
- 🟡 `pmd:ImmutableField` L1366
Field 'nonSerializableField' may be declared final
- 🟡 `pmd:PublicMemberInNonPublicType` L1378
Public member 'getInstance' declared in a non-public type
- 🟡 `pmd:PublicMemberInNonPublicType` L1390
Public member 'getInstance' declared in a non-public type
- 🟡 `pmd:NonThreadSafeSingleton` L1391
单例实现不是线程安全的
建议: 使用 enum 单例、静态持有者（holder）或双重检查加 volatile。
- 🔵 `pmd:UnnecessaryFullyQualifiedName` L402
不必要使用全限定名
建议: 使用已导入的简单类名代替全限定名。
- 🔵 `pmd:DoNotThrowExceptionInFinally` L727
在 finally 块中抛出异常会使控制流难以理解
建议: 不要在 finally 中抛出异常，先记录或吞掉 finally 中的异常。
- 🔵 `pmd:InstantiationToGetClass` L801
不要仅为获取 Class 对象而实例化
建议: 使用 Integer.class 而不是 new Integer(1).getClass()。
- 🔵 `pmd:StringBufferInstantiationWithChar` L904
new StringBuffer(char) 会把 char 隐式转为 int 容量
建议: 使用 new StringBuffer() 或 new StringBuffer("c") 明确意图。
- 🔵 `pmd:InvalidLogMessageFormat` L1112
日志消息格式参数数量不匹配
建议: 修正占位符数量：一个 {} 对应一个参数。
- 🔵 `pmd:InvalidLogMessageFormat` L1113
Too many arguments, expected 1 argument but found 2
- 🔵 `pmd:UnnecessaryFullyQualifiedName` L1184
Unnecessary qualifier 'java.io': 'Serializable' is already in scope because it is imported in this file
AI 审查 · 9 条建议
- 🔴 [AI] [bug] `rethrow-missing-throws` L48
**捕获 IOException 后重新抛出但方法未声明 throws IOException，编译失败**
ReThrow.bad() 中 catch (IOException e) 后直接 throw e，但 bad() 没有 throws IOException，无法编译。
建议: 在方法签名上增加 throws IOException，或者更简单：不要捕获该异常，直接让 doWork() 的异常向外传播。
- 🔴 [AI] [bug] `wrap-same-missing-throws` L61
**包装 IOException 抛出但方法未声明 throws IOException，编译失败**
WrapSame.bad() 中 catch 后 throw new IOException(...)，但 bad() 未声明 throws IOException，代码无法编译。
建议: 为 bad() 增加 throws IOException，或捕获后改为抛出一个非受检异常。
- 🔴 [AI] [bug] `finalize-protected-inaccessible` L565
**显式调用 Object.finalize() 违反访问控制，无法编译**
CallFinalize.bad() 中通过 Object 引用调用 o.finalize()，但 Object.finalize() 是 protected 方法，不在同包且不是通过子类引用访问，编译不通过。
建议: 删除该调用；如果需要清理资源，使用 AutoCloseable/Cleaner。
- 🔴 [AI] [bug] `null-inputstream-skip-npe` L637
**InputStream 初始化为 null 后直接调用 skip()，必现 NPE**
CheckSkip.bad() 中 InputStream in = null，随后调用 in.skip(10)，运行时必然抛出 NullPointerException。
建议: 初始化真实流，并用 try-with-resources 管理生命周期，同时检查 skip 返回值。
- 🔴 [AI] [performance] `infinite-loop-inner-increment` L1133
**内层循环误递增外层变量 i，且 k 永不变，导致无限循环**
JumbledInc.foo() 的内层循环 for (int k = 0; k < 20; i++) 更新的是 i 而不是 k，k 恒为 0，内层循环永不退出，程序将挂起。
建议: 内层循环应递增自己的控制变量 k。
- 🟡 [AI] [design] `bean-getter-setter-naming` L317
**getter/setter 未遵循 JavaBean 命名规范，影响框架绑定**
BadBean 中 getname/setname 不符合 JavaBean 规范，应为 getName/setName，否则很多序列化/绑定框架无法识别。
建议: 将 getter 改为 getName()，setter 改为 setName(String name)。
- 🟡 [AI] [security] `singleton-cast-classcastexception` L1039
**重载 getInstance(Object) 中无类型检查直接强转，会抛 ClassCastException**
SingletonDemo.getInstance(Object obj) 直接 (SingletonDemo) obj，传入非 SingletonDemo 对象时抛出 ClassCastException，且该重载破坏了单例语义。
建议: 删除该重载方法；如果确需接收对象，应先 instanceof 校验后再处理。
- 🟡 [AI] [bug] `log-exception-as-string` L1101
**日志只输出异常的 toString，丢失堆栈信息**
CorrectLog.bar() 中 _LOG.error(String.valueOf(e)) 只记录异常字符串，无法看到堆栈；应把异常对象作为最后一个参数传给日志 API。
建议: 使用 _LOG.error("doWork failed", e)，保留异常堆栈。
- 🟡 [AI] [bug] `loop-break-on-first-iteration` L1222
**循环第一次迭代就 break，后续逻辑成为死代码**
BranchLastInLoop.foo() 中 if (i > 25) 永远不成立（i 最大为 9），而循环体末尾的 break 无条件执行，导致循环只执行一次。
建议: 检查循环终止条件，删除多余的 break，或把 break 放入有意义的条件判断中。
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