Java继承案例

最新推荐文章于 2024-09-10 11:00:00 发布

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本文介绍了如何使用Java实现类的继承，展示了Personn类作为基类，Student类作为其子类的实例，并展示了如何通过构造函数和成员变量进行信息传递。主要关注了封装和子类扩展属性的方法。

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package com.msc.example;
class Personn{
    private String name ;
    private String addr ;
    private String sex ;
    private int age ;
    public Personn() {} ;
    public Personn(String name,String sex) {
        this(name,sex,"",0);
    }
    public Personn(String name,String sex,String addr,int age) {
        this.addr = addr ;
        this.age = age ;
        this.name = name ;
        this.sex = sex ;
    }
    public String  getInfo(){
        return "父类: " + addr +","+age+","+name+","+sex;
    }
}
class Student extends Personn{
    private double math ;
    private double english ;
    public Student(){};
    public Student(String name,String sex){
       super(name,sex) ;
    }
    public Student(String name,String addr,String sex,int age,double math,double english) {
        super(name,addr,sex,age) ;
        this.math = math ;
        this.english = english ;
    }
    public String  getInfo(){
        return "子类：" + super.getInfo()+","+math+","+english;
    }
}
public class SuccessClass {
    public static void main(String[] args) {
       Personn per = new Student("张三","北京","男",23,36.0,89.0) ;
       System.out.println( per.getInfo());
       per = new Student("张三","男") ;
       System.out.println( per.getInfo());
    }
}