Java Button Action Command

Question

I'm creating a simple Minesweeper game in Java. Size 9x9.

I create an array of JPanels and an array of buttons; I add each button to its respective JPanel. then i add the JPanels to the JFrame.

How do i distinguish between each button on the action event?

Here's some of my code:

int gridx = 9;
int gridy = 9;
JButton[] buttons = new JButton[gridx*gridy];
JPanel[] jpanels = new JPanel[gridx*gridy];

public Minesweeper(){

    super("Minesweeper");


    setLayout(new GridLayout(9,9));
    JPanel panel = new JPanel();
    int i = 0;
    for(i = 0; i<gridx*gridy; i++){
        jpanels[i] = new JPanel();
        buttons[i] = new JButton();
        buttons[i].addActionListener(buttonEvent);
        jpanels[i].setLayout(new GridLayout(1,1));
        jpanels[i].add(buttons[i]);
        add(jpanels[i]);            
    }
    //buttons[67].setEnabled(false);
    setSize(300,300);
    setVisible(true);
}

The only way i can think about doing this is adding text to the button like so:

    buttons[i] = new JButton(i);

Then calling getActionCommand() but i dont want text to show up on the button. Any other ideas?

I suspect you can play with the getSource() method of the ActionEvent object that you get when you get called back on your ActionListener#actionPerformed method stub. — Santa
– Santa, Commented May 1, 2014 at 18:07
You do not need jpanels, and here it might work better to leave out panel too, as the content pane got the GridLayout. — Joop Eggen
– Joop Eggen, Commented May 1, 2014 at 18:12
FYI, is there any particular reason why you're using a JButton[] instead of a JButton[][]? Sure you can map your JButton[81] to a JButton[9][9] but why would you? — Cruncher
– Cruncher, Commented May 1, 2014 at 18:58

Cruncher · Accepted Answer · 2014-05-01 18:13:51Z

1

You can use AbstractButton#setActionCommand.

In your loop:

buttons[i].setActionCommand(i+"");

Then you'll get i back when you use getActionCommand

Note I did mention in a comment on another answer that I would create a new class Mine which extends JButton which I believe to be a better and more complete solution. This however gets the job done rather quickly.

answered May 1, 2014 at 18:13

Cruncher

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2 Comments

user3521471 Over a year ago

Ahh! Yes, this does it. I didnt know you could set things other than strings in that. Thank you! I will mark yours as an accepted answer once i get enough reputation to do so.

Cruncher Over a year ago

@user3521471 You can only set String as the action command. The i+"" converts i to a String. When you use getActionCommand you're going to have to convert it back to an integer.

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