设计模式之代理模式

public interface subject(){
void do();
}
//具体实现类
public class RealSubject implements Subject(){
public void do(){
//这里是具体的实现
}
}

//代理类
public class ProxySubject implements Subject{
//代理类会持有具体实现类的引用
private RealSubject realSubject;
public ProxySubject(RealSubject realSubject) {
this.realSubject = realSubject;
}
//调用代理做的事情，实际上还是具体的实现类在操作
public void do(){
realSubject.do();
}
}

public class Client(){
public static void main(String[] args){
RealSubject realSubject = new RealSubject();
ProxySubject proxySubject = new ProxySubject(realSubject );
proxySubject.do();

}
}