Question

   /**
   * Returns an array of booleans that are set true or
   * false based on the associated values in the array
   * arr using the following rules:
   * 1. If arr[i] is divisible by three then the boolean
   * value in the the array returned at the same position
   * should be true
   * 2. Unless the values in arr[i] is also divisible by 5,
   * then the value returned in that position should be false.
   * 3. It should also be false for any values not divisible
   * by 3.
   * So for example, if arr = {3, 15, 21, 7, 10} then the
   * array returned would be {true, false, true, false, false}.
   * NOTE: The original array must NOT be changed by this method!
   *
   * @param arr array holding the int values to test
   * @return a boolean array as described above
   */
   public static boolean[] divByThree(int[] arr) {
       // TODO: Implement this method
      
       // TODO: remove the following line before completing
       // this line is only here to allow the template
       // to compile.
return new boolean[0];
   }

Answer 1

/**
 * Returns an array of booleans that are set true or
 * false based on the associated values in the array
 * arr using the following rules:
 * 1. If arr[i] is divisible by three then the boolean
 * value in the the array returned at the same position
 * should be true
 * 2. Unless the values in arr[i] is also divisible by 5,
 * then the value returned in that position should be false.
 * 3. It should also be false for any values not divisible
 * by 3.
 * So for example, if arr = {3, 15, 21, 7, 10} then the
 * array returned would be {true, false, true, false, false}.
 * NOTE: The original array must NOT be changed by this method!
 *
 * @param arr array holding the int values to test
 * @return a boolean array as described above
 */
public static boolean[] divByThree(int[] arr) {
    boolean[] result = new boolean[arr.length];
    for (int i = 0; i < arr.length; i++) {
        result[i] = arr[i] % 3 == 0 && arr[i] % 5 != 0;
    }
    return result;
}