Question

I’m working on an assignment for my Intro to Java course and I’m currently stuck trying to sort an array of integers.

I get the values from a point object array, p, and pass them to an int array of the same size, pSize. All I need is the point object’s value of x to be typecast to int and get the array sorted. However, that is not occuring. Here is the code:

import java.util.*;
import java.awt.*;

public class doCheckWin {
// Class Fields
private Point[] p;
private static int pSize;

/*
        Class Constructor.
        Creates an array of point objects that holds the user's
        location of pieces.
*/
public doCheckWin(Point[] p) {
        this.p = p;
        pSize = p.length;
}

public void checkHorizontal() {
        int[] col = new int[pSize];
        for(int i=0; i<p.length; i++) {
            col[i] = (int)p[i].getX();
        }
        Arrays.sort(col);
        System.out.println(Arrays.toString(col));
    } 
}

Here’s the method from another classthat passes the point object:

public void checkWin(Point[] p) {
    doCheckWin dcw = new doCheckWin(p);
    dcw.checkHorizontal();
}

When I print the array to screen, the values are ints…using getX changes them to double but when typecasting to int it’s not working…

The problem is:

1. Typecasting the value of x (ie: 10.0) to an integer does not work. When printing the results out on the screen I still get 10.0.
2. Arrays.sort(col) is not sorting the array.

Sample Output of What I’m Getting

10.0
13.0
12.0
11.0
3.0

What I Want

3
10
11
12
13

Edit: Here’s the code used to print out the array:

Arrays.sort(col);
for(int i=0; i<col.length; i++) {
    System.out.println(col[i]);
}

Answer 1

What is the point of your Point object (no pun intended)?

What is the contents of p[]? Is it an array of Point objects like you said? If so, why are you creating a point object from a point object?

It looks like you want to do something like so:

int[] col = new int[pSize];
for (int i = 0; i < p.length; i++) {
    col[i] = (int)p[i].getX();
}
Arrays.sort(col);
System.out.println(Arrays.toString(col));

That seem to work for me.

Here is an example:

int pSize = 5;
Point[] p = new Point[pSize];

Random z = new Random();
for (int i = 0; i < p.length; i++) {
    p[i] = new Point(i+z.nextInt(5), i);
}

System.out.println(Arrays.toString(p));

int[] col = new int[pSize];
for (int i = 0; i < p.length; i++) {
    col[i] = (int)p[i].getX();
}
Arrays.sort(col);
System.out.println(Arrays.toString(col));

Which gives:

[java.awt.Point[x=3,y=0], java.awt.Point[x=3,y=1], java.awt.Point[x=6,y=2], java.awt.Point[x=3,y=3], java.awt.Point[x=4,y=4]]
[3, 3, 6, 3, 4]
[3, 3, 3, 4, 6]