mock probability with lottery

public class TestLottery {static int BASE_RANDOM_NUM=1000;  private static int getProbabilityIndex(final List<Double> probabilityList){Map<Integer,Double> mapRates= calculateBaseProbability(probabilityList);int randomProbability=RandomUtils.nextInt(BASE_RANDOM_NUM);Set<Entry<Integer, Double>>  sets=mapRates.entrySet();for(Entry<Integer, Double> entry:sets){if (entry.getValue() >= randomProbability && entry.getValue() <= BASE_RANDOM_NUM) {return entry.getKey();}}return -1;}private static Map<Integer,Double> calculateBaseProbability(final List<Double> probabilityList){Map<Integer,Double> mapRates=new HashMap<Integer, Double>();double sumProbability=0.0;int index=0;Iterator<Double> itor= probabilityList.iterator();while(itor.hasNext()){double probability=itor.next();if(probability>0){sumProbability+=probability;mapRates.put(index, sumProbability*BASE_RANDOM_NUM);}index++;}return mapRates;}          public static List<Double> createDoubleList(){    List<Double> orignalRates=new ArrayList<Double>();orignalRates.add(0.0);orignalRates.add(0.0);orignalRates.add(0.6);orignalRates.add(0.3);orignalRates.add(0.1);return orignalRates;    }public static void main(String[] args) {Map<Integer,Double> proMap=new HashMap<Integer, Double>();double sumCount=100000;List<Double> orignalRates=createDoubleList();for (double i = 0; i < sumCount; i++) {int index =getProbabilityIndex(orignalRates);if(proMap.containsKey(index)){proMap.put(index, proMap.get(index)+1.0);}else{proMap.put(index, 1.0);}}Set<Entry<Integer, Double>> setEntry=proMap.entrySet();for(Entry<Integer, Double> entry:setEntry){System.out.println( entry.getKey()+"("+entry.getValue()+")->rate:"+ entry.getValue()/sumCount);}}}