this() call in a constructor

[Kamila Bertran]

Hello my lovelies!

I've got another (though one) for you. I have this piece of code (still testing):

class Building {
  Building() { System.out.print("b "); }
  Building(String name) {
  this(); System.out.print("bn " + name);
  }
 }

public class House extends Building {
  House() { System.out.print("h "); }
  House(String name) {
  this(); System.out.print("hn " + name);
  }

public static void main(String[] args){
  new House("x ");
  }
 }

So basally I am creating an anonymous object with an 'x ' parameter. That should invoke House(String name){...} constructor. Now that one invokes this() which if I get it right would trigger no-argument constructor of House class. So... according to my calculations I should get output: h hn x but I get b h hn x
Now is it because Building no argument constructor prints b and as House extends Building , Building's no argument constructor is going to be called as well? Or is there some higher Maths to it?

[Ole Sandum]

You forgot to take into account that if no call to either this(...) or super(...) is issued, the compiler will automatically add in a no-arg super() call.

Does this answer your question?

[Ganish Patil]

Kamila Bertran wrote:House extends Building , Building's no argument constructor is going to be called as well?

Yes, have look at this

[Ganish Patil]

What do you think what would be the output, If we remove this() on line no 11? here

 this(); System.out.print("hn " + name);

[Kamila Bertran]

Yes, thanks guys. It does answer my question and clear my doubts. Ta!

[Kamila Bertran]

Ganish Patil wrote:What do you think what would be the output, If we remove this() on line no 11? here

 this(); System.out.print("hn " + name);

Hmm... Following the logic the output should be b hn x

[Ganish Patil]

Kamila Bertran wrote:Hmm... Following the logic the output should be b hn x