only14.java

/*
Given an array of ints, return true if every element is a 1 or a 4.

only14([1, 4, 1, 4]) → true
only14([1, 4, 2, 4]) → false
only14([1, 1]) → true
*/
public boolean only14(int[] nums) {
  for(int i=0; i <nums.length; i++) {
    if(nums[i] != 1 && nums[i] != 4) {
      return false;
    }
  }
  return true;
}