I have 3 JAVA methods I need help fixing. I have posted screenshots and they are sorting methods and Im just confused on why Im getting the errors I am getting.

Sorts a list of Persons using merge sort * @param list public static void mergeSort (ArrayList list) // Provide this code if (list.size() > 1) // Merge sort the first half ArrayList firstHalfnew intlist.size System.arraycopy (list, , firstHalf, 0, list.size() / 2),; mergeSort (firstHalf); // Merge sort the second half int secondHalfLength list . size() - list. size() / 2; ArrayList secondHalf = new int[secondHalfLengthI; System.arraycopy (list, list.size() / 2, secondHalf, 0, secondHalfLength); mergeSort (secondHalf); // Merge firstHalf with secondHalf into list merge (firstHalf, secondHalf, list)