Question

Im learning Java and Im creating a memory type game where you have to find two equal cards.

I have created a Window etc etc but my problem is adding multiple JButtons to it. (my cards are JButtons with icons). I have commented my code where my problem is.

//Get the images.
private File bildmapp = new File("bildmapp");
private File[] bilder = bildmapp.listFiles();
//My own class extending JButton
Kort[] k = new Kort[bilder.length];

for(int i = 0; i < bilder.length; i++){
        k[i] = new Kort(new ImageIcon(bilder[i].getPath()));
    }



//Later in my code:
    int sum = rows * columns;
    Kort[] temp = new Kort[sum];

            //My function to randomize.
    Verktyg.slumpOrdning(k);

            //***********************//
            //Trying to fill a array from K (which contains all cards) so my temp contains SUM cards and SUM/2 pairs
    for(int i = 0; i < sum/2; i++){
        temp[i] = k[i];
        temp[i+sum/2] = k[i];
    }


            //Problem is that i only get SUM/2 (half of the cards) cards, not the 16 (8 pairs) i would like to  add in this case
            //SYNLIGT = VISIBLE.
    for(int i = 0; i < sum; i++){
        temp[i].setStatus(Kort.Status.SYNLIGT);
        j.add(temp[i]);
    }

Answer 1

Your code ends up adding each Kort object to the container twice, since the array temp contains two references to each Kort. When you add a Kort a second time, it moves to the second location. A Component can only appear in one place at a time.