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定义Annotation (注解) 是 Java 5 引入的新特性。提供了一种安全的类似注释的机制，将任何信息或者元数据(metadata) 与程序元素( 类、方法、成员变量等 )，关联起来。为程序元素 ( 类、方法、成员变量 )提供了更直

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