单例模式之饿汉式

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

//接口
interface MyInterface {
	public void action();
}

// 被代理类
class MyObject implements MyInterface {
	@Override
	public void action() {
		System.out.println("我是被代理类,执行action！");
	}
}

//被代理接口
interface ClothFactory{
	public void productCloth();
}

//被代理类
class NikeClothFactory implements ClothFactory{

	@Override
	public void productCloth() {
		System.out.println("我是被代理类，Nike 生产衣服");
	}
}

//实现InvocationHandler接口的子类
class MyInvocationhandler implements InvocationHandler {

	private Object obj;

	public void setObject(Object obj) {
		this.obj = obj;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		System.out.println("动态代理类执行，收代理费");
		Object returnVal = method.invoke(obj, args);
		return returnVal;
	}

}

//动态代理类
class MyProxy {

	public static Object getProxyInstance(Object obj, InvocationHandler handler) {
		return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj
				.getClass().getInterfaces(), handler);
	}
}

public class TestProxy {

	/**
	 * @Title: main
	 * @Description:
	 * @param：
	 * @return void
	 * @user： wangzg
	 * @Date：2014-10-27
	 * @throws
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		//被代理类
		MyObject myObject = new MyObject();

		MyInvocationhandler myInvocationhandler = new MyInvocationhandler();
		myInvocationhandler.setObject(myObject);
		Object myProxy =  MyProxy.getProxyInstance(myObject, myInvocationhandler);
		MyInterface myInterface = (MyInterface)myProxy;
		myInterface.action();

		NikeClothFactory nikeClothFactory = new NikeClothFactory();
		myInvocationhandler.setObject(nikeClothFactory);
		Object myProxyNike =  MyProxy.getProxyInstance(nikeClothFactory, myInvocationhandler);
		ClothFactory clothFactory = (ClothFactory)myProxyNike;
		clothFactory.productCloth();
	}

}