Java继承案例

╰半橙微兮° 2023-01-06 11:58 139阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNDgwNjA3_size_16_color_FFFFFF_t_70]

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());
        }
    }

**输出**  
![在这里插入图片描述][2021011417091936.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNDgwNjA3_size_16_color_FFFFFF_t_70]: /images/20221119/1dd6f7e1f1854f9194e196ef6d6ed8be.png
[2021011417091936.png]: https://img-blog.csdnimg.cn/2021011417091936.png