代码示例
编辑
示例说明
假设有一个
Italk接口，有空的方法talk（）（说话），所有的people对象都实现（implements）这个接口，实现talk（）方法，前端有很多地方都将people实例化，执行talk方法，后来发现这些前端里有一些除了要说话以外还要唱歌（sing），那么我们既不能在Italk接口里增加sing()方法，又不能在每个前端都增加sing方法，我们只有增加一个代理类talkProxy，这个代理类里实现talk和sing方法，然后在需要sing方法的客户端调用代理类即可，代码如下：
接口类Italk
public interface Italk {
public void talk(String msg);
}
实现类people
public class People 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 People(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);
}
}
代理类talkProxy
public class TalkProxy implements Italk {
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);
}
}
}
应用端myProxyTest
public class MyProxyTest {
* @param args
*/
public static void main(String[] args) {
//不需要执行额外方法的
Italk people1=new People("
湖海散人","18");
people1.talk("No ProXY Test");
System.out.println("-----------------------------");
//需要执行额外方法的
TalkProxy talker=new TalkProxy(people1);
talker.talk("ProXY Test","
七里香");
}
}
