7 接口参数

如果一个方法的参数是接口类型，我们就可以将任何实现该接口的类的实例引用传递给该接口的参数，那么接口参数就可以回调类实现的接口方法。

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){  //这里只用传接口类型的值，也就是 引用类型的值，也就是说传递了一个接口的实现类的对象的引用。而这个引用可以直接调用实现接口的类的方法
        hello.speakHello();
    }
}
public class Example6_5 {
    public static void main(String args[]){
        KindHello kindHello=new KindHello();
        kindHello.lookHello(new Chinese());
        kindHello.lookHello(new English());
    }

}

TRANSLATE with x English

Arabic	Hebrew	Polish
Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian

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标签：SpeakHello,Chinese,void,接口,参数,English,public
来源： https://www.cnblogs.com/xianbing2022/p/16444978.html