Question:
How can I capture KeyEvents in a Frame that doesn’thave any TextFields or TextAreas?
Answer:
To enable a particular AWTEvent in a Component it suffices to add alistener for that event. When the first listener for a particularevent type is registered, that event automatically becomes enabled forthe component. So, all you have to do is add a KeyListener as in thefollowing example:
import java.awt.*;import java.awt.event.*;public class KeyDemo { public static void main(String[] args) { Frame frame = new Frame("foo"); WindowListener exitListener; exitListener = new WindowAdapter() { public void windowClosing(WindowEvent e) { Window window = e.getWindow(); window.setVisible(false); window.dispose(); System.exit(0); } }; frame.addWindowListener(exitListener); frame.addKeyListener( new KeyListener() { public void keyPressed(KeyEvent e) { System.out.println("keyPressed: " + e.toString()); } public void keyReleased(KeyEvent e) { System.out.println("keyReleased: " + e.toString()); } public void keyTyped(KeyEvent e) { System.out.println("keyTyped: " + e.toString()); } }); frame.setSize(400, 400); frame.setVisible(true); }}
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