please help with the output of this java code including explanation, as I am very confused about this problem. thank you!

The following program produces 4 lines of output. Write each line of output below as it would appear on the console. import java.util.*; // for Arrays class public class ReferenceMysteryl { public static void main(String[] args) { int x = ; int[] a = new int[4]; X++ : mystery(x, a); System.out.println(x + " Arrays.toString(a)); : X mystery(x, a); System.out.println(x + " " + Arrays.toString()); public static void mystery(int x, int[] a) { X+ ; a[x]++ System.out.println(x + " " + Arrays.toString()); line 1 line 2 line 3 line 4