Java super keyword: Super calls the constructor of the parent class and uses super to access the members of the parent class

Use super to call the constructor of the parent class

super(parameter-list);

public People(String name,int age,String sex,String sn)
{
    this.name=name;
    this.age=age;
    this.sex=sex;
    this.sn=sn;
}
public People(String name,String sn)
{
    this.name=name;
    this.sn=sn;
}

public Student(String name,String sn,String stuno,String department)
{
    super(name,age,sex,sn);    //调用父类中含有4个参数的构造方法
    this.stuNo=stuno;
    this.department=department;
}
public Student(String name,String stuNo)
{
    super(name,sn);    //调用父类中含有两个参数的构造方法
    this.stuNo=stuNo;
}

Using super to access parent class members

super.member

Example 1

//父类Animal的定义
public class Animal
{
    public String name;    //动物名字
}
//子类Cat的定义
public class Cat extends Animal
{
    private String name;    //名字
    public Cat(String aname,String dname)
    {
        super.name=aname;    //通过super关键字来访问父类中的name属性
        this.name=dname;    //通过this关键字来访问本类中的name属性
    }
    public String toString()
    {
        return"我是"+super.name+"，我的名字叫"+this.name;
    }
    public static void main(String[] args)
    {
        Animal cat=new Cat("动物","喵星人");
        System.out.println(cat);
    }
}

我是动物，我的名字叫喵星人