代理模式

public interface Italk {
    public void talk(String msg);
}




public class Person implements Italk {

    public String username;
    public String age;

    public String getName() {
        return username;
    }

    public void setName(String name) {
        this.username = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public Person(String name1, String age1) {
        this.username = name1;
        this.age = age1;
    }

    public void talk(String msg) {
        System.out.println(msg + "!你好,我是" + username + "，我年龄是" + age);
    }

}


public class TalkProxy implements Italk {

    private Italk talker;

    public TalkProxy(Italk talker) {
        // super();
        this.talker = talker;
    }

    public void talk(String msg) {
        talker.talk(msg);
    }

    public void talk(String msg, String singname) {
        talker.talk(msg);
        sing(singname);
    }

    private void sing(String singname) {
        System.out.println("唱歌：" + singname);
    }
}



public class MyProxyTest {

    public static void main(String[] args) {
        // 不需要执行额外方法的
        Italk person = new Person("王云浩", "20");
        person.talk("No ProXY Test");
        System.out.println("lxit-----------------------------");
        // 需要执行额外方法的
        TalkProxy talker = new TalkProxy(person);
        talker.talk("ProXY Test", "行百里者半九十");
    }
}