protectedProxy(InvocationHandler h);

staticClass getProxyClass(ClassLoader loader,Class[] interfaces);

staticObject newProxyInstance(ClassLoader loader,Class[]interfaces,InvocationHandlerh);

 interface LianJia {
   public void sellHouse();
   public void loan();
 }

public class HouseMaster implements LianJia {
  @Override
  public void sellHouse() {
    System.out.println("我有房子要賣");
  }
  @Override
  public void loan() {
    System.out.println("我要貸款做生意");
  }
}

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
public class CreatProxy implements InvocationHandler{
  //聲明被代理對象（之所以用Object是因為他在Java中是所有類包含自定義類的超類）
  private Object target;
  //創(chuàng)建代理對象（根據(jù)被代理對象需求）
  public Object bind(Object target){
    this.target = target;
    //使用Proxy類創(chuàng)建一個動態(tài)代理對象
    Object proxy = Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this);
    return proxy;
  }
  //具體執(zhí)行業(yè)務(wù)的方法
    /**
     * proxy: 代理類對象
     * method：被代理對象的方法
     * args:被代理對象方法的參數(shù)
     */
  public Object invoke(Object proxy, Method method, Object[] args)
      throws Throwable {
    //調(diào)用業(yè)務(wù)方法
    method.invoke(target);
    return null;
  }
}

public class Test {
  public static void main(String[] args) {
    HouseMaster hm = new HouseMaster();
    CreatProxy cp = new CreatProxy();
    LianJia lj = (LianJia) cp.bind(hm);
    lj.sellHouse();
    lj.loan();
  }
}