垃圾回收

Posted 2020-09-14 艺海浮台

1、

1 public interface MyService {
2     public int add(int a , int b);
3     public int sub(int a , int b);
4 }

2、实现类

 1 /**
 2  * 实现类
 3  */
 4 public class MyServiceImpl implements MyService,YourService {
 5     public int add(int a, int b) {
 6         return a + b ;
 7     }
 8     public int sub(int a, int b) {
 9         return a - b;
10     }
11     public int multiply(int a, int b) {
12         return a * b ;
13     }
14     public float divide(int a, int b) {
15         return (float)a / b;
16     }
17     public int shiftLeft(int a, int b) {
18         return a << b ;
19     }
20     public int shiftRight(int a, int b) {
21         return a >> b ;
22     }
23 
24     public int singleAnd(int a, int b) {
25         return a & b;
26     }
27     
28     public boolean doubleAnd(int a, int b) {
29         return false && true;
30     }
31 }

3、

1 public interface YourService {
2     public int multiply(int a , int b);
3     public float divide(int a , int b);
4     public int shiftLeft(int a,int b);
5     public int shiftRight(int a,int b);
6     public int singleAnd(int a,int b);
7     public boolean doubleAnd(int a,int b);
8     
9 }

4、

 1 public class ProxyMain {
 2     public static void main(String[] args) {
 3         System.out.println("ProxyMain.hashcode : " + ProxyMain.class.hashCode());
 4         MyServiceImpl s = new MyServiceImpl();    //目标对象
 5         System.out.println("s.hashcode : " + s.hashCode());
 6         TimeHandler h = new TimeHandler(s);        //处理器对象
 7         Class[] clazz = {MyService.class,YourService.class} ;//代理接口数组
 8         MyService ms = (MyService) Proxy.newProxyInstance(ProxyMain.class.getClassLoader(), clazz, h);
 9         System.out.println(ms.add(2 , 2));
10         System.out.println(((YourService)ms).multiply(2,2));
11         System.out.println(ms.sub(2 , 2));
12         System.out.println(((YourService)ms).shiftLeft(1,2));
13         System.out.println(((YourService)ms).shiftRight(4,2));
14         System.out.println(((YourService)ms).singleAnd(4,2));
15         System.out.println(((YourService)ms).doubleAnd(4,2));
16         System.out.println(((YourService)ms).divide(4, 4));
17         System.out.println(((YourService)ms).divide(4, 4));
18     }
19     
20     /**
21      * 时间处理器
22      */
23     static class TimeHandler implements InvocationHandler{
24         //目标对象
25         private Object target;
26         
27         public TimeHandler(Object target){
28             this.target = target ;
29         }
30         
31         public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
32             long start = System.nanoTime() ;
33             //调用目标对象的方法
34             Object retVal = method.invoke(target, args);
35             System.out.println(method.getName() + " : " + (System.nanoTime() - start));
36             //切记:返回目标对象方法的返回值，否则篡改了业务逻辑。
37             return retVal;
38         }
39     }
40 }