Proxy 代理

package v1ch02;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

import java.util.Arrays;

import java.util.Random;

public class ProxyTest {

public static void main(String[] args) {

Object[] elements = new Object[1000];

for(int i = 0 ; i < elements.length ; i++){

Integer value = i+1;

InvocationHandler handler = new TranceHandler(value);

Object proxy = Proxy.newProxyInstance(null, new Class[]{Comparable.class}, handler);

elements[i] = proxy;

}

Integer key = new Random().nextInt(elements.length)+1;

int result = Arrays.binarySearch(elements, key);

if(result >= 0)System.out.println(elements[result]);

}

}

class TranceHandler implements InvocationHandler{

public TranceHandler(Object target){

this.target = target;

}

@Override

public Object invoke(Object proxy, Method method, Object[] args)

throws Throwable {

System.out.print(target);

System.out.print("."+method.getName()+"(");

if(args != null){

for(int i = 0 ; i <args.length;i++){

System.out.print(args[i]);

if(i < args.length - 1)

System.out.print(",");

}

}

System.out.println(")");

return method.invoke(target, args);

}

private Object target;

}