/* Return an array that contains the exact same numbers as the given array, * but rearranged so that all the zeros are grouped at the start of the array. * The order of the non-zero numbers does not matter. So {1, 0, 0, 1} becomes * {0 ,0, 1, 1}. You may modify and return the given array or make a new array. */ public int[] zeroFront(int[] nums) { if(nums.length == 0) return nums; int i = 0; while(nums[i] == 0) i++; for(int j = i + 1; j < nums.length; j++) { if(nums[j] == 0) { int temp = nums[i]; nums[i] = nums[j]; nums[j] = temp; i++; } } return nums; }