Java面向对象实践-优快云博客

本文链接：https://blog.youkuaiyun.com/spt_genius/article/details/2824848

本文介绍了一个Java程序示例，展示了枚举、重载、继承及this和super关键字的应用。通过具体的Person类及其子类Men和Women，实现了不同人物角色的语言输出。

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/*
* 理解重载，继承，枚举，this和super的用法
*/

public class Start{
public static void main(String[] args){
    Person person = new Men(Person.sex.MEN, Person.ethnic.WRITE, "English");
    person.say();
}
}
class Person{
static public enum sex {MEN, WOMEN}; // 枚举
static public enum ethnic {WRITE, YELLOW, BLACK}
public String language;

public Person(sex sex, ethnic ethnic, String language){
    this.language = language; //this的用法, 引用隐式参数
    System.out.println(sex + ethnic + language);
}
public void say(){ // overloading 重载
    System.out.println("Person say in " + this.language + "."); // 应用隐式参数
}
public void say(String language){ // overloading 重载
    System.out.println("Person say in " + language + ".");
}
}

class Men extends Person{
public Men(sex sex, ethnic ethnic, String language){
    super(sex, ethnic, language); // super的用法，调用超类的构造
}
public void say(){
    super.say(); // super的第二个用法，调用超类的方法
    System.out.println("Men say in " + language + ".");
}
}

class Women extends Person{
public Women(sex sex, ethnic ethnic, String language){
    super(sex, ethnic, language);
}
public void say(){
    super.say();
    System.out.println("Women say in " + language + ".");
}
}

java的基础