Question

How can I make a piece of code that will generate me my bitmaps by chance. I want a 50% chance for bitmap1, 50% for bitmap2 and 20% for bitmap3. Can I get some advice on how to do that?

I know how to do it for fifty-fifty:

Random r = new Random();
int randBall = r.nextInt(2);

if (randBall == 0) {
   return Gball;
} else if (randBall == 1) {
   return Bball;
}

But if I want to add one more ball with a 20% chance of spawning, I don’t know how to do that.

Answer 1

You can use the java Random.nextInt(int) method.
Call nextInt(100); and use

int p1 = 30;
int p2 = 50;

if ( n < p1 )
   return GBall;
else if ( n >= p1 && n < p1 + p2 )
   return BBall;
else // n < 100, always holds
   return RBall;