Undefined constructor (java)

Question

so I have a java class called User that contains a constructor like this:

public class User extends Visitor {
    public User(String UName, String Ufname){
              


        

Answer 1

You must call the Visitor's constructor on the first like of the constructor that extends the Visitor's class, using super():

public User(String UName,String Ufname){
    super();
    setName(UName);
    setFname(Ufname);
}

and if you want Admin to have a custom constructor too, you must call:

super(uname, ufname) // String, String - pass the params of the superclass cunstructor

So:

public Admin() {
    super(someString, someString);
}