Random value from enum with probability

Question

I have an enum that I would like to randomly select a value from, but not truly random. I would like some of the values to be less likely of being selected so far. Here is

Answer 1

You can use EnumeratedDistribution from the Apache Commons Math library.

EnumeratedDistribution distribution = new EnumeratedDistribution<>(
        RandomGeneratorFactory.createRandomGenerator(new Random()),
        List.of(
                new Pair<>(Type.TYPE_A, 0.2), // get TYPE_A with probability 0.2
                new Pair<>(Type.TYPE_B, 0.5), // get TYPE_B with probability 0.5
                new Pair<>(Type.TYPE_C, 0.3)  // get TYPE_C with probability 0.3
        )
);

Type mySample = distribution.sample();