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注解java:

package com.hsb.annotation;

import java.lang.annotation.*;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)

public @interface MyAnnotation {
 String value() default "";
 String getName() default "haha";
}

 

測試java :

 

package com.hsb.annotation;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class AnnotationMain {

 @MyAnnotation("sdf")
 public String getTes() {
  return "heshai";
 }
    public void print() {
     System.out.println("-------- AnnotationMain ---*--- print --------: " + "ddd");
    }
 public static void main(String[] args) {
  Method[] an = AnnotationMain.class.getMethods();
  for (Method m : an) {
   if (m.isAnnotationPresent(MyAnnotation.class)){
     System.out.println("-------- AnnotationMain ---*--- main --------: " + m.getName());
     System.out.println("-------- AnnotationMain ---*--- main --------: " + m.getReturnType().getName());
        MyAnnotation annotation  =   m.getAnnotation(MyAnnotation.class);
        System.out.println("-------- AnnotationMain ---*--- main --------: " + annotation.value());
        System.out.println("-------- AnnotationMain ---*--- main --------: " + annotation.getName());
                  try {
     System.out.println("-------- AnnotationMain ---*--- main --------: " + m.invoke(AnnotationMain.class.newInstance(), null));
    } catch (IllegalArgumentException e) {
     
     e.printStackTrace();
    } catch (IllegalAccessException e) {
     
     e.printStackTrace();
    } catch (InvocationTargetException e) {
     
     e.printStackTrace();
    } catch (InstantiationException e) {
     
     e.printStackTrace();
    }
   }

  }
 }
}