which constructor question

[Paul Salerno]

public class Test {
  int c = 0;
  public Test(int a, int b) {
     c = b*(a/12);
  }
  public Test(int a){
    c = a/12;
  }
  public Test(int a, int b, float c) {
    <<statement>>
  }
}

What statement should be entered to initialize c?
Answer: this(a,b);
My question is: why wouldnt this(a) work to init the second constructor() listed here?

[Travis Benning]

I'm not for sure, but i think it's because this refers to the super Test.
if you want to just initialize the Test(int a) method, i think you need either this.Test(a).
Am i right?

[Darren Tweedale]

Ehrm, not sure.
but I am puzzled about the answer. Who told you that?
I haven't tried it yet, but at first glance I didn't think it would compile with the statement :
c = b * (a / 12)? since the division would cause the result be to a float and "c" is an integer, so a cast would be required?
Sorry, I am stumpted!

[Junilu Lacar]

Originally posted by Darren Tweedale:
but at first glance I didn't think it would compile with the statement :
c = b * (a / 12)? since the division would cause the result be to a float and "c" is an integer, so a cast would be required?

Darren, since a is an int, (a / 12) would be an integer division. No conversion is done on the operands and a cast is not needed: the result would simply be truncated to an integer which is then multiplied by b.
FWIW, I would agree that the original question is poorly structured.

[sun ram]

I think answer is in-correct, we can have this(a) constructor call also .
-SR

Originally posted by Paul Salerno:

public class Test {
  int c = 0;
  public Test(int a, int b) {
     c = b*(a/12);
  }
  public Test(int a){
    c = a/12;
  }
  public Test(int a, int b, float c) {
    <<statement>>
  }
}

What statement should be entered to initialize c?
Answer: this(a,b);
My question is: why wouldnt this(a) work to init the second constructor() listed here?