JAVA中数据求众数是如何实现的呢？

求众数 * * * @param arr * @return */ publicstaticdoublegetMode(double[] arr){ Map<Double, Integer> map =new HashMap<Double, Integer>(); for(int i =0; i < arr.length; i++){ if(map.containsKey(arr[i])){ map.put(arr[i], map.get(arr[i])+1); }else{ map.put(arr[i],1); } } int maxCount =0; double mode =-1; Iterator iter = map.keySet().iterator(); while(iter.hasNext()){ double num = iter.next(); int count = map.get(num); if(count > maxCount){ maxCount = count; mode = num;