简单代理例子

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;
???Class[] interfaces=value.getClass().getInterfaces();
???InvocationHandler handler = new TraceHandler(value);
???Object proxy = Proxy.newProxyInstance(null, interfaces,handler);
???elements[i]=proxy;
???
??}
??Integer key = new Random().nextInt(elements.length)+1;
??System.out.println("start:"+key);
??int result = Arrays.binarySearch(elements, key);
??if(result>=0)System.out.println(elements[result]);
?}
?
?
}
class TraceHandler implements InvocationHandler
{

?
?public TraceHandler(Object t){
??target= t;
?}
?public Object invoke(Object proxy, Method m, Object[] args)
???throws Throwable {
??System.out.print(target);
??System.out.print("."+m.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 m.invoke(target,args);
?}
?private Object target;
?
}