Q:

KeyPressed event in java

I have just created a java tic-tac-toe game i would like to figure out how to run a method once the enter key is pressed during a certain condition an example is below...
if(/*condition is met*/){
     //keyListener
}

A:

Depending on where you want to trap the "enter" key, you could use an ActionListener (on such components such as text components or buttons) or attach a key binding to you component
public class MyPanel extends JPanel {

    public MyPanel() {

        InputMap im = getInputMap(WHEN_FOCUSED);
        ActionMap am = getActionMap();

        im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "onEnter");

        am.put("onEnter", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // Enter pressed
            }
        });

    }

}

This will rely on the component being focused.

A:

One way is to implement the KeyListener interface and its key event methods.  For example,
public class MyClass  implements KeyListener {
    public void keyTyped(KeyEvent e) {
        // Invoked when a key has been typed.
    }

    public void keyPressed(KeyEvent e) {
        // Invoked when a key has been pressed.
        if (e.getKeyCode() == KeyEvent.VK_ENTER && yourOtherCondition) {
            myMethod();
        }
    }

    public void keyReleased(KeyEvent e) {
        // Invoked when a key has been released.
    }
}

Then add this listener with
myComponent.addKeyListener(new MyClass());

Or if you prefer,
myComponent.addKeyListener(new KeyListener() {
    public void keyPressed(KeyEvent e) { /* ... */ }

    public void keyReleased(KeyEvent e) { /* ... */ }

    public void keyTyped(KeyEvent e) { /* ... */ }
});

See this for more details.

