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BJP3 Self-Check 7.20: ReferenceMystery2

Language/Type: Java arrays reference semantics
Author: Marty Stepp (on 2013/09/02)

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 ReferenceMystery2 {
    public static void main(String[] args) {
        int x = 1;
        int[] a = new int[2];
        mystery(x, a);
        System.out.println(x + " " + Arrays.toString(a));
        a[1] = a.length;
        mystery(x, a);
        System.out.println(x + " " + Arrays.toString(a));
    public static void mystery(int x, int[] list) {
        System.out.println(x + " " + Arrays.toString(list));
line 1
line 2
line 3
line 4

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