import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
 
/**
 * Created by tripm on 13.05.2019.
 */
public class Main extends Random {
 
    public static void main(String[] args) {
        Main r = new Main();
        int prev = 0;
        for (int i = 0; i < 100; i++) {
            int rnd = r.next24();
            System.out.println("rnd = " + rnd);
            if (prev == rnd)
                System.out.println("!!!!!!");
            prev=rnd;
        }
    }
 
 
    List<Integer> values = IntStream.range(0, 24).boxed().collect(Collectors.toList());
 
    int next24() {
        int rnd = values.remove(nextInt(values.size() - 2));
        values.add(rnd);
        return rnd;
    }
}
 

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