代理模式（接口和子类）

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接口：

package com.alice.Proxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class Client{
         public static void main(String[] args) {
   //2.改final
         final Springbrothder sb=new Springbrothder();
    /*     Proxy proxy=(Proxy) Proxy.newProxyInstance(sb.getClass().getClassLoader(), sb.getClass().getInterfaces(), new InvocationHandler() {
//1.必须是Hummer 类
    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
      throws Throwable {
     // TODO Auto-generated method stub
     return null;
    }
   });

   */

          Hummer proxy=(Hummer) Proxy.newProxyInstance(sb.getClass().getClassLoader(), sb.getClass().getInterfaces(), new InvocationHandler() {
           //必须是Hummer 类
             @Override
             public Object invoke(Object proxy, Method method, Object[] args)
               throws Throwable {
              if("sing".equals(method.getName())){
               double money=(Double)args[0];
               if(money>=10000)
               return method.invoke(sb, money/2);
              }
              if("dance".equals(method.getName())){
               method.invoke(sb, 20000);
              }
              return null;
             }
            });

          proxy.sing(10); //3.调用 proxy
          proxy.sing(10000);
}

}

子类：

package com.alice.Proxy2;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.InvocationHandler;

public class Client {

public static void main(String[] args) {
final Springbrothder sb=new Springbrothder();

Springbrothder client=(Springbrothder)Enhancer.create(Springbrothder.class,new InvocationHandler() {

   @Override
   public Object invoke(Object proxy, Method method, Object[] args)
     throws Throwable {
    if("sing".equals(method.getName())){
     double money=(Double)args[0];
     if(money>=10000)
     return method.invoke(sb, money/2);
    }
    if("dance".equals(method.getName())){
     method.invoke(sb, 20000);
    }
    return null;
   }
});

client.sing(10); //3.调用 proxy
client.sing(10000);
}
}