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referenceMystery3

Language/Type: Java parameters reference semantics

The following program produces 4 lines of output. Write each line of output below as it would appear on the console.

null 
public class ReferenceMystery3 {
    public static void main(String[] args) {
        int x = 1;
        int[] a = new int[2];
        mystery(x, a);
        System.out.println(x + " " + Arrays.toString(a));

        x--;
        a[1] = a.length;
        mystery(x, a);
        System.out.println(x + " " + Arrays.toString(a));
    }

    public static void mystery(int x, int[] a) {
        a[x]++;
        x++;
        System.out.println(x + " " + Arrays.toString(a));
    }
}
line 1
line 2
line 3
line 4

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