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Functional Java is an open source library that supports closures for the Java programming language

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package fj;

public abstract class Rng {

	public abstract P2 nextInt();

    public abstract P2 nextLong();

    // [low, high] inclusive
    public final P2 range(int low, int high) {
        return nextNatural().map2(x -> (x % (high - low + 1)) + low);
    }


	public final P2 nextNatural() {
		return nextInt().map2(x -> x < 0 ? -(x + 1) : x);
	}


}