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referenceMystery

Author: Marty Stepp (on 2010/12/28)

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 BasicPoint {
    int x;
    int y;

    public BasicPoint(int x, int y) {
        this.x = x;
        this.y = y;
    }
}   

public class ReferenceMystery {
    public static void main(String[] args) {
        int n = 10;
        int[] a = {20};  // an array with just one element
        BasicPoint p = new BasicPoint(30, 40);

        mystery(n, a, p);
        System.out.println(n + " " + Arrays.toString(a) + " " + p.x + "," + p.y);

        a[0]++;
        p.x++;
        mystery(n, a, p);
        System.out.println(n + " " + Arrays.toString(a) + " " + p.x + "," + p.y);
    }

    public static int mystery(int n, int[] a, BasicPoint p) {
        n++;
        a[0]++;
        p.y++;
        System.out.println(n + " " + Arrays.toString(a) + " " + p.x + "," + p.y);
        return n;
    }
}
line 1
line 2
line 3
line 4

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