Java实现代理模式

抽象角色

package test.proxy;

/**
* Created by dubby on 16/3/28.
*/
public interface Demo {
String hello();
}

真实角色

package test.proxy;

/**
* Created by dubby on 16/3/28.
*/
public class DemoImp implements Demo {
public String hello() {
return "Hello";
}
}

代理角色

package test.proxy;

/**
* Created by dubby on 16/3/28.
*/
public class ProxyDemo implements Demo {

private Demo demo;

public ProxyDemo(){
this.demo = new DemoImp();
}

public String hello() {
return demo.hello() + "被代理的结果.";
}
}

测试

package test.proxy;

/**
* Created by dubby on 16/3/28.
*/
public class Main {

public static void main(String[] args) {
ProxyDemo proxyDemo = new ProxyDemo();
System.out.println(proxyDemo.hello());
}
}

结果

Hello被代理的结果.