Random boolean with weight or bias

Question

I need to generate some random booleans. However I need to be able to specify the probability of returning true. As a results doing:

private R         


        

Answer 1

I was wondering if there is a better or more natural way of doing this.

The approach you're using already is fine.

^* As far as I know, there's not a standard Java method that will make this code any shorter.

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_{* For non-cryptographic purposes.}

Answer 2

    public boolean getBiasedRandom(int bias) {
      int c;
      Random t = new Random();
     // random integers in [0, 100]
      c=t.nextInt(100);
      if (c>bias){return false;
      }
      else{return true;}
      }

This one is based on percentage...

Answer 3

1) Yes, i think your approach is valid and I don't see another easier way.

2) There is a library for handling random numbers of different statistical distributions:

http://introcs.cs.princeton.edu/java/22library/StdRandom.java.html

Answer 4

Expanding on user2495765's answer, you can make a function which takes an input ratio (as two values chance:range see code)

public class MyRandomFuncs {
    public Random rand = new Random();

    boolean getBooleanAsRatio(int chance, int range) {
        int c = rand.nextInt(range + 1);
        return c > chance;
    }

}

Depending on what you intend to do, you probably don't want to initalize Random from within your method but rather use as a class variable (as in the code above) and call nextInt() from within your function.

Answer 5

The MockNeat library implements this feature.

Example for generating a boolean value that has 99.99% of being true:

MockNeat m = MockNeat.threadLocal();
boolean almostAlwaysTrue = m.bools().probability(99.99).val();

Answer 6

Random object needs to be intialized already.

public static boolean flipRandom(double probability) {
    Validate.isBetween(probability, 0, 1, true);
    if(probability == 0)
        return false;
    if(probability == 1)
        return true;
    if(probability == 0.5)
        return random.nextBoolean();
    return random.nextDouble() < probability ? true : false;
}