애노테이션 - 애노테이션과 상속

- 클래스 상속

package annotation.basic.inherited;

import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

@Inherited // 클래스 상속시 자식도 애노테이션 적용
@Retention(RetentionPolicy.RUNTIME)
public @interface InheritedAnnotation {
}

package annotation.basic.inherited;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

@Retention(RetentionPolicy.RUNTIME)
public @interface NoInheritedAnnotation {
}

package annotation.basic.inherited;

@InheritedAnnotation
@NoInheritedAnnotation
public class Parent {
}

package annotation.basic.inherited;

public class Child extends Parent {
}

 

 

- 인터페이스 적용

package annotation.basic.inherited;

@InheritedAnnotation
@NoInheritedAnnotation
public interface TestInterface {
}

package annotation.basic.inherited;

public class TestInterfaceImpl implements TestInterface {
}

 

 

- 실행 코드

package annotation.basic.inherited;

import java.lang.annotation.Annotation;

public class InheritedMain {

    public static void main(String[] args) {
        print(Parent.class);
        print(Child.class);
        print(TestInterface.class);
        print(TestInterfaceImpl.class);
    }

    private static void print(Class<?> clazz) {
        System.out.println("class: " + clazz);
        for (Annotation annotation : clazz.getAnnotations()) {
            System.out.println(" - " + annotation.annotationType().getSimpleName());
        }
        System.out.println();
    }
}

 

- 실행 결과

class: class annotation.basic.inherited.Parent
 - InheritedAnnotation
 - NoInheritedAnnotation

class: class annotation.basic.inherited.Child
 - InheritedAnnotation

class: interface annotation.basic.inherited.TestInterface
 - InheritedAnnotation
 - NoInheritedAnnotation

class: class annotation.basic.inherited.TestInterfaceImpl

 

- 클래스 상속은 @InheritedAnnotation 만 적용

- 인터페이스는 애노태이션 적용 안됨