128-java-generics

Review and improve Java code using comprehensive generics best practices that enforce compile-time type safety and enable flexible, reusable APIs.

Prerequisites: Run ./mvnw compile or mvn compile before applying any change. If compilation fails, stop immediately and do not proceed — compilation failure is a blocking condition.

Core areas: Type safety (avoiding raw types, eliminating unsafe casts), code reusability (generic methods and types for multiple type contexts), API clarity (PECS wildcards — ? extends for producers, ? super for consumers), performance optimization (eliminating boxing/casting overhead), diamond operator for type inference, type erasure awareness (type tokens, factory patterns, array creation), generic inheritance...

当您需要审查、改进或重构 Java 代码以提高泛型质量时使用，包括避免原始类型、应用通配符的 PECS（生产者扩展消费者超级）原则、使用有界类型参数、设计有效的泛型方法、利用菱形运算符、理解类型擦除含义、正确处理泛型继承、使用 @SafeVarargs 防止堆污染，以及将泛型与现代 Java 功能（如记录、密封类型和模式匹配）集成。 java 技能项目的一部分 来源：jabrena/cursor-rules-java。