Java Coding Problems

108. Changing array size

Increasing the size of an array is not straightforward. This is because Java arrays are of a fixed size and we cannot modify their size. The solution to this problem entails creating a new array of the requisite size and copying all the values from the original array to this one. This can be done via the Arrays.copyOf() method or via System.arraycopy() (used internally by Arrays.copyOf()).

For an array of primitives (for example, int), we can add the value to an array after increasing its size by 1 as follows:

public static int[] add(int[] arr, int item) {  int[] newArr = Arrays.copyOf(arr, arr.length + 1);  newArr[newArr.length - 1] = item;  return newArr;}

Or, we can remove the last value as follows:

public static ...