代理模式（Proxy）

public class TestProxy {
	public static void main(String[] args) {
		Object obj = new ProxyObject();
		obj.action();
	}
}
interface Object {
	void action();
}
class ProxyObject implements Object {
	Object obj;
	public ProxyObject() {
		System.out.println("Creat ProxyObject");
		obj = new ObjectImpl();
	}
	@Override
	public void action() {
		System.out.println("ProxyObject start");
		obj.action();
		System.out.println("ProxyObject end");
	}
}
class ObjectImpl implements Object {
	@Override
	public void action() {
		System.out.println("=====ObjectImpl start=====");
		System.out.println("=====ObjectImpl doing=====");
		System.out.println("=====ObjectImpl end=====");
	}
}