KeyPressed event in java

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南笙
南笙 2021-01-03 04:34

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...

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  • 2021-01-03 05:07

    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.

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  • 2021-01-03 05:25

    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.

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  • 2021-01-03 05:26

    Caveat - It's been a while since I did desktop applications, but the java.awt.Component class has an addKeyListener() method which you can use to register a class that implements KeyListener - is this what you are looking for?

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