Random with preview functionality

ClairvoyantRandom.java

package net.darkseraphim.util;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;

/**
 * @Author DarkSeraphim
 */
public class ClairvoyantRandom extends Random
{

    private Map<Integer, Integer> clairvoyance = new HashMap<Integer, Integer>();

    public int previewNextInt(int n)
    {
        int i = super.nextInt(n);
        clairvoyance.put(n, i);
        return i;
    }

    @Override
    public int nextInt(int n)
    {
        Integer i = clairvoyance.remove(n);
        return i != null ? i : super.nextInt(n);
    }
}