Exercise : array mystery practice-it

Suppose that each array at right were passed as a parameter to the mystery method below. Fill in the boxes with the array contents after each method call. 

public static void mystery(int[] a) {
    for (int i = 0; i < a.length - 1; i++) {
        if (a[i] < a[i + 1]) {
            a[i] = a[i + 1];
        }
    }
}
int[] a1 = {2, 4};
mystery(a1);		 
{4, 4}
[^0-9,]+
int[] a2 = {1, 3, 6};
mystery(a2);		 
{3, 6, 6}
[^0-9,]+
int[] a3 = {7, 2, 8, 4};
mystery(a3);		 
{7, 8, 8, 4}
[^0-9,]+
int[] a4 = {5, 2, 7, 2, 4};
mystery(a4);		 
{5, 7, 7, 4, 4}
[^0-9,]+
int[] a5 = {2, 4, 6, 3, 7, 9};
mystery(a5);		 
{4, 6, 6, 7, 9, 9}
[^0-9,]+