package com.itbuluoge.anno;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Test {

  public static void trackUseCases(List<Integer> useCases,Class<?> cl)
  {
    for(Method m:cl.getDeclaredMethods())
    {
      UseCase uc=m.getAnnotation(UseCase.class);
      if(uc!=null)
      {
        System.out.println("FOUND:"+uc.id()+" "+uc.description());
      }
    }
    
    for(int i:useCases)
    {
      System.out.println("Warning.."+i);
    }
  }
  
  public static void Case(Class<?> cl)
  {
    for(Method m:cl.getDeclaredMethods())
    {
      UseCase uc=m.getAnnotation(UseCase.class);
      if(uc!=null)
      {
        System.out.println("FOUND:"+uc.id()+" "+uc.description());
      }
    }
  }
  /**
   * @param args
   */
  public static void main(String[] args) {
    //List<Integer> useCases=new ArrayList<Integer>();
    //Collections.addAll(useCases, 41,42);
    //trackUseCases(useCases,Testable.class);
    
    Case(Testable.class);
  }

}


package com.itbuluoge.anno;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.junit.Test;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@interface UseCase
{
  public int id();
  public String description() default "no des";
}

public class Testable {

  @UseCase(id=19,description="中国人")
  public void say()
  {
    
  }
  
  @UseCase(id=19)
  public void listen()
  {
    
  }
}




输出结果

Java解析注解_java