Java quickie

[reds4ever]

can someone tell me why passing this boolean argument:

ballThread[i] = new Thread(new BallThread (ballArray [i], even)

to this:

public BallThread (Ball b, boolean e)

causes an error? it compiles fine without the boolean, all the variables are declared etc

even is just a boolean value based on whether an object in a thread is odd or even

cheers

[raghar]

Are you sure that boolean even=true; ?

[Skanky Burns]

What exactly is the error when you try to compile it?

[reds4ever]

thanks for responding, i'm still finding my feet with this, in answer to your questions

even = ((i %2) ==0);

that gives true or false?

the error is: 'constructor BallThread (Ball, boolean) not found in class .......'

as soon as i stop passing the boolean argument the program complies ok

thanks

[Skanky Burns]

Thought so.

You need a constructor BallThread (Ball, boolean) in the BallThread class that instanciates a BallThread object.

In other words, find the BallThread (Ball) object, copy the whole "function" and paste it below, then add a boolean functionality.

To explain what I mean, this is a quick demonstration.

   BallThread( Ball b )
   {
      //This is your original function
      this.ball = b;
   }

   BallThread( Ball b, boolean e )
   {
      //This is the new one you create
      this.ball = b;
      this.even = e;
   }

Hope this helps.

[reds4ever]

many thanks Skanky, thats exacty what i needed! i was on the crest of a wave being able to tell if a number was odd or even!

even = ((i %2) ==0); // in one line as well!!!

line, then that error came up.

i still don't understand why i need the line 'even=e' before i use it, 'e' is passed to the constructor why can't i use it 'as-is'

thanks

[Skanky Burns]

That was just for demonstration purposes. In my example, the object stores that value for later use. For your program, you may use it when you initiate the object or store it too - what you need to do with it depends very much on what your program is doing and, well, what you need that value for.

Basically, if you don't need to store the value, then you don't need that line.

[reds4ever]

gotcha! thats what i couldn't understand

thanks again

[raghar]

Originally posted by reds4ever
new BallThread (ballArray [i], ((i %2) ==0))

And I don't understand how can someone write one custom constructor and forget to write second.

Please tell me that you are just few week old student of Java, or you are heavilly overworked person.

[reds4ever]

Originally posted by raghar


And I don't understand how can someone write one custom constructor and forget to write second.

Please tell me that you are just few week old student of Java, or you are heavilly overworked person.

got my first 'idiots guide' book the end of Febuary, weve all got to start sometime!!

i'll get there in the end, in the meantime, be on standby.....!!

[raghar]

Well, it took me 6 months to find difference between public main (String ) and public main (string). I looked at Delphi at that time period and didn't have time to look at it properly. BTW it was windoze fault. It closed console window so quickly so I have no chance to see error message.

[Skanky Burns]

I open a dos window for compiling, just so I can see the errors (if they ever occur)

[reds4ever]

i'm getting a lot of 'Doh!' moments, if you know what i mean?