java--Annotation实现

@SuppressWarnings("unused")
@Deprecated
public class RealFood implements Food{
 @SuppressWarnings("unused")
 @Deprecated
 @Override
 public void eat() {
 int x;
 System.out.println("吃饭 ，，，，，RealFood");
 }
}

import java.lang.annotation.Annotation;
import com.hbsi.proxy.RealFood;
public class TestDemo {
 public static void main(String[] args) {
 Class<?> cls = RealFood.class;
 Annotation[] annotations = cls.getAnnotations();
 for (int i = 0; i < annotations.length; i++) {
 System.out.println(annotations[i]);
 }
 }
}

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
//此注解在运行范围内有效
@Retention(value=RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
 public String name() default "hbsi";//定义name属性
 public String values();//定义values属性
}

import com.hbsi.annotation.MyAnnotation;
@MyAnnotation(name="hbsi",values="hebei")
public class RealFood implements Food{
 @Override
 public void eat() {
 int x;
 System.out.println("吃饭 ，，，，，RealFood");
 }
}

import java.lang.annotation.Annotation;
import com.hbsi.annotation.MyAnnotation;
import com.hbsi.proxy.RealFood;
public class TestDemo {
 public static void main(String[] args) {
 Class<?> cls = RealFood.class;
 Annotation[] annotations = cls.getAnnotations();
 for (int i = 0; i < annotations.length; i++) {
 MyAnnotation annotation = cls.getAnnotation(MyAnnotation.class);
 System.out.println(annotation.name());
 System.out.println(annotation.values());
 System.out.println(annotation.annotationType());
 }
 }
}