Example6_5.java

interface SpeakHello {    void speakHello();}class Chinese implements SpeakHello {   public  void speakHello() {       System.out.println("中国人习惯问候语：你好,吃饭了吗? ");   }}class English implements SpeakHello {    public  void speakHello() {       System.out.println("英国人习惯问候语:你好,天气不错 ");    }}class KindHello {   public void lookHello(SpeakHello hello) { //接口类型参数       hello.speakHello();                    //接口回调   }}public class Example6_5 {   public static void main(String args[]) {       KindHello kindHello=new KindHello();       kindHello.lookHello(new Chinese());       kindHello.lookHello(new English());   }}