Java接口定义以及使用（代理设计）

interface Subject {// 核心主题
public void make();
}

class RealSubject implements Subject {
@Override
public void make() {
System.out.println("正在执行主题");
}
}

class PoxySubject implements Subject {
private Subject subject;
public PoxySubject(Subject subject) {
this.subject=subject;
}
public void prepare() {
System.out.println("准备主题");
}
@Override
public void make() {
this.prepare();
this.subject.make();
this.end();
}
public void end() {
System.out.println("主题执行完毕");
}
}

public class ProxyDemo {
public static void main(String[] args) {
Subject suject=new PoxySubject(new RealSubject());
suject.make();
}
}