// Use this function
public void increaseSize() {
   String[] temp = new String[original.length + 1];
   
   for (int i = 0; i < original.length; i++){
      temp[i] = original[i];
   }
   original = temp;
}

The size of an array cannot be changed after instantiation
If you need to change the size, create a new array and copy the contents
or use an ArrayList which does require a set size

 newSizeArray = Arrays.copyOf(oldsizeArray, newSize);

String[] array = scan.nextLine().split(" ");