Creating a Proxy Object : Proxy « Reflection « Java Tutorial

1. Java Tutorial
2. Reflection
3. Proxy

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

interface MyInterface {
  void method();
}

class MyInterfaceImpl implements MyInterface {
  public void method() {
    System.out.println("method");
  }
}

class ProxyClass implements InvocationHandler {
  Object obj;

  public ProxyClass(Object o) {
    obj = o;
  }

  public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
    Object result = null;
    try {
      System.out.println("before the method is called ");
      result = m.invoke(obj, args);
    } catch (Exception eBj) {
    } finally {
      System.out.println("after the method is called"); 
    }
    return result;
  }
}

public class Main {
  public static void main(String[] argv) throws Exception {
    MyInterface myintf = (MyInterface) Proxy.newProxyInstance(MyInterface.class.getClassLoader(),
        new Class[] { MyInterface.class }, new ProxyClass(new MyInterfaceImpl()));
    myintf.method();
  }
}