静态代理模式
代理：顾名思义就是需要另外一方代替做事情呗。
模拟场景：小蜜代替老板做事情。我要找老板要点钱，老板很忙，我就去找他小蜜，找了他小蜜，他小蜜给了钱。小蜜可能还不单只有给钱的功能，具体大家想象...^_^
下面就是静态代理的代码喽：

//老板的功能    public interface  Subject {  public void  operate();}

 //老板登场     public class RealSubject implements Subject {public void operate() {       System.out.println("this is real subject");}}

//小蜜出现了 public class ProxySubject implements Subject {private RealSubject realSubject;public void operate() {realSubject = new RealSubject();System.out.println("play other operate");realSubject.operate();}}

public class DoAction {public static void main(String[]args){Subject  subject = new ProxySubject();             subject.operate();}}