面向对象二 继承例子

学生类：

public class Lianxi1 {
        public String name;
        public String sex;
        public int age;
        public String sno;
        
        public Lianxi1(){
            
        }
        public Lianxi1(String _name,String _sex,int _age){
            name= _name;
            sex= _sex;
            age= _age;
        }
        public String showInfo(){
            return name+","+sex+","+age+"岁";
        }
}

public class Students extends Lianxi1{
    public String sno;
    public String classNum;
    
    public Students(){
        
    }
    public Students(String _name,String _sex,int _age,String _sno,String _classNum){
           super(_name, _sex, _age);
           sno= _sno;
           classNum= _classNum;
    }
    public String showInfo(){
           String str=super.showInfo();
           str="学号是"+sno+"，"+classNum+"班号是";
           return str;
    }

}

public class Xuesheng{
    public static void mian(String[] arge){
        
        //Lianxi1 s=new Lianxi1();
        
        Students s=new Students("蝙蝠侠","男",40,"170102222","170203");
                
                
        /*s.name="小明";
        s.age=23;
        s.sex="男";
        s.sno="20170111";*/
        
        String str =s.showInfo();
        System.out.println(str);
    }
}