Question

I have an ArrayList of int arrays that is returning false when I ask if it contains the specified coordinates. It does contain the coordinates I request so it should return TRUE.

Here’s my code.

    //debug code
    for (int i = 0; i < Locations.size(); i++)
    {
        int[] TestLoc = Locations.get(i);

        System.out.print(TestLoc[0] + " " + TestLoc[1] + " " + TestLoc[2] + " == " + Location[0] + " " + Location[1] + " " + Location[2] + "? - ");

        if (Location == TestLoc)
        {
            System.out.println("TRUE");
        }

        else
        {
            System.out.println("FALSE");
        }
    }

    //real code
    if (Locations.contains(Location))
    {
        Locations.remove(Location);
    }

    else
    {
        System.out.println("FAIL");
    }

And output, requesting the coordinates 57, 64, 105 when the list contains 4 coordinates.

56 64 105 == 57 64 105? – FALSE

56 64 106 == 57 64 105? – FALSE

56 64 107 == 57 64 105? – FALSE

57 64 105 == 57 64 105? – FALSE

What gives???

Answer 1

The best would be to get a data class, for instance Coordinate to store your data and override the equals method. Another option, if you just store phone numbers, could be to use strings to reprensent well formatted phone numbers, and the use the equals method of the String class.