### Question:
ArrayUtil { public static Integer[] doubleBitCount(double[] arr) { Integer[] len = new Integer[arr.length]; for (int i = 0; i < arr.length; i++) { len[i] = doueleBitCount(arr[i]); } return len; }  static int doueleBitCount(double dd); static Integer[] doubleBitCount(double[] arr);  }### Answer:
@Test public void testdoubleBitCount() { int size = 1000000; double[] arr = new double[size]; for (int i = 0; i < size; i++) { arr[i] = ((double) 1) / (i + 1); } ArrayUtil.doubleBitCount(arr); }