Java之简单代理的例子

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;
 
}