/* Given a non-empty array of ints, return a new array containing the * elements from the original array that come before the first 4 in the * original array. The original array will contain at least one 4. Note that * it is valid in java to create an array of length 0. */ public int[] pre4(int[] nums) { int i = 0; while(nums[i] != 4) i++; int[] arr = new int[i]; for(int j = 0; j < i; j++) arr[j] = nums[j]; return arr; }