Random + java + chaque fois un nouveau valeur

import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;


public class Random8 {

       private static final int MAX_VALUE = 8;

	public static void main(String[] args) {
		Map<Integer, Integer> map = new HashMap<Integer, Integer>();
		List<Integer> list = new LinkedList<Integer>();
		int insertedValues = 0;
		while (insertedValues < MAX_VALUE) {
			Integer random = new Integer((int) Math.ceil(Math.random() * 8));
			if(!map.containsKey(random)) {
				map.put(random, null);
				list.add(random);
				insertedValues++;
			}
		}
		
		Iterator<Integer> it = list.iterator();
		while (it.hasNext()) {
                        //traitement souhaité (ici affichage)
			System.out.println(it.next());
		}
	}

}