Calling a Constructor within Super Class

Question

I am learning how to make a superclass. I have been successful setting it all up I just need help learning how to call a default constructor.

Here is what I have Superclass file:

public class Date {

private int month;
private int day;
private int year;

Date() {

}

Date(int passedMonth, int passedDay, int passedYear){
   month = passedMonth;
   day = passedDay;
   year = passedYear;
}

SubClass:

public class GregorianDate extends Date {
//*************** Constructors ***********************
GregorianDate() {
    long numToAdd = System.currentTimeMillis();
    numToAdd += java.util.TimeZone.getDefault().getRawOffset();
    numToAdd /= 86400000;
    super.addDays(numToAdd);
}
//Parameterized constructor
GregorianDate(int passedYear, int passedMonth, int passedDay){
    super(passedMonth, passedDay, passedYear);
}

What I need to do is call the default constructor in the sub class to update the correct default constructor to today's date. somehow in the superclass to assign the month, day, and year values.

Have a look [here](https://docs.oracle.com/javase/tutorial/java/IandI/super.html) — Jeroen Heier, Mar 16 '18 at 05:01
Thats the page I was looking at and it still didn't quite make sense. Also update the question a little to make a little more sense. — user9501082, Mar 16 '18 at 05:04
Go through the link it might help you "https://stackoverflow.com/questions/1814953/c-sharp-constructor-chaining-how-to-do-it" — Arun, Mar 16 '18 at 05:08

score 0 · Answer 1 · answered Mar 16 '18 at 05:12

0

The super class should have its own initialisers in the constructors that you can selectively override in the sub class constructors.

Which is not possible unless you have the super class in code.

Hope this addresses your doubt.

answered Mar 16 '18 at 05:12

Vasu Inukollu

120
1
3
10

So, am I even close with the attempt I have going right now? – user9501082 Mar 16 '18 at 05:14
Change the default constructor in the super class and assign the month, day and year. – Vasu Inukollu Mar 16 '18 at 05:15
so do like month = what tho? How can I can I call the subclass constructor since that does all the math? – user9501082 Mar 16 '18 at 05:19
I dont expect anyone to do it for me but lead in in the right direction/hint would be awesome. – user9501082 Mar 16 '18 at 05:27

Calling a Constructor within Super Class

1 Answers1