Springboot常用注解之@Inherited和@interface

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Springboot常用注解之@Inherited和@interface

1. @Inherited：允许子类继承父类的注解，仅限于类注解有用，对于方法和属性无效。 

   测试元注解

   1.1 包含@Inherited注解

@Documented @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface InheritedTrue { String value(); }

  1.2 不包含@Inherited注解

@Documented @Retention(RetentionPolicy.RUNTIME) public @interface InheritedFalse { String value(); }

1.3 测试父类

@InheritedTrue("InheritedTrue class") @InheritedFalse("InheritedFalse class") public class InheritedParent { @InheritedTrue("InheritedTrue method") @InheritedFalse("InheritedFalse method") public void methodTest(){ } @InheritedTrue("InheritedTrue no override method") @InheritedFalse("InheritedFalse no override method") public void methodInherttTest(){ } @InheritedTrue("InheritedTrue field") @InheritedFalse("InheritedFalse field") public String stringTest; }

   1.4 测试子类

public class InheritedChild extends InheritedParent{ @Override public void methodTest(){} }

  1.5  单元测试父类

@RunWith(SpringRunner.class) @SpringbootTest public class WalletTests { private Logger logger = LoggerFactory.getLogger(WalletTests.class); @Before public void init() { logger.info("开始测试-----------------"); } @After public void after() { logger.info("测试结束-----------------"); } }

 1.6 单元测试

public class InheritedTest extends WalletTests { private Logger logger = LoggerFactory.getLogger(InheritedTest.class); @Test public void InheritTest() throws NoSuchMethodException, NoSuchFieldException { Class<InheritedChild> child = InheritedChild.class; logger.info("对类进行测试"); if(child.isAnnotationPresent(InheritedTrue.class)){ logger.info(child.getAnnotation(InheritedTrue.class).value()); } if(child.isAnnotationPresent(InheritedFalse.class)){ logger.info(child.getAnnotation(InheritedFalse.class).value()); } logger.info("对重写方法进行测试"); Method method = child.getMethod("methodTest", null); if(method.isAnnotationPresent(InheritedTrue.class)){ logger.info(method.getAnnotation(InheritedTrue.class).value()); } if(method.isAnnotationPresent(InheritedFalse.class)){ logger.info(method.getAnnotation(InheritedFalse.class).value()); } logger.info("对继承方法进行测试"); Method methodInherit = child.getMethod("methodInherttTest", null); if(methodInherit.isAnnotationPresent(InheritedTrue.class)){ logger.info(methodInherit.getAnnotation(InheritedTrue.class).value()); } if(methodInherit.isAnnotationPresent(InheritedFalse.class)){ logger.info(methodInherit.getAnnotation(InheritedFalse.class).value()); } logger.info("对属性进行测试"); Field field = child.getField("stringTest"); if(field.isAnnotationPresent(InheritedTrue.class)){ logger.info(field.getAnnotation(InheritedTrue.class).value()); } if(field.isAnnotationPresent(InheritedFalse.class)){ logger.info(field.getAnnotation(InheritedFalse.class).value()); } } }

1.7 测试结果

     可以看出只对类的继承有用，对于方法的重写和继承以及属性无效。

 

 2.@Interface

    自定义注释类型。java用  @interface Annotation{ } 定义一个注解 @Annotation，一个注解是一个类。

@Documented @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface InterfaceTest { String value() default "InterfaceTest"; }

    

 

本文标签： 注解常用SpringBootInheritedinterface