logo Practice-It logo

Main Page → Problems → Solve a Problem

BJP5 Self-Check 7.19: ReferenceMystery1

Language/Type: Java arrays reference semantics
Author: Marty Stepp (on 2019/09/19)

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 ReferenceMystery1 {
    public static void main(String[] args) {
        int x = 0;
        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(a));
    }
    
    public static void mystery(int x, int[] a) {
        x++;
        a[x]++;
        System.out.println(x + " " + Arrays.toString(a));
    }
}
line 1
line 2
line 3
line 4

You must log in before you can solve this problem.


Log In

If you do not understand how to solve a problem or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect problems/tests, etc.), please

Is there a problem? Contact a site administrator.