makeLast.java

/*
Given an int array, return a new array with double the length where its last element is the same as the original array, and all the other elements are 0. The original array will be length 1 or more. Note: by default, a new int array contains all 0's.

makeLast([4, 5, 6]) → [0, 0, 0, 0, 0, 6]
makeLast([1, 2]) → [0, 0, 0, 2]
makeLast([3]) → [0, 3]
*/
public int[] makeLast(int[] nums) {
  int[] a = new int[2*nums.length];
  for(int i=0; i < a.length-1; i++) {
    a[i] = 0;
  }
  a[a.length-1] = nums[nums.length-1];
  return a;
}