Demonstrating the KeyListener
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class KeyTest {
public static void main(String args[]) {
JFrame frame = new JFrame("Key Listener");
Container contentPane = frame.getContentPane();
KeyListener listener = new KeyListener() {
public void keyPressed(KeyEvent e) {
dumpInfo("Pressed", e);
}
public void keyReleased(KeyEvent e) {
dumpInfo("Released", e);
}
public void keyTyped(KeyEvent e) {
dumpInfo("Typed", e);
}
private void dumpInfo(String s, KeyEvent e) {
System.out.println(s);
int code = e.getKeyCode();
System.out.println("\tCode: " + KeyEvent.getKeyText(code));
System.out.println("\tChar: " + e.getKeyChar());
int mods = e.getModifiersEx();
System.out.println("\tMods: "
+ KeyEvent.getModifiersExText(mods));
System.out.println("\tLocation: "
+ location(e.getKeyLocation()));
System.out.println("\tAction? " + e.isActionKey());
}
private String location(int location) {
switch (location) {
case KeyEvent.KEY_LOCATION_LEFT:
return "Left";
case KeyEvent.KEY_LOCATION_RIGHT:
return "Right";
case KeyEvent.KEY_LOCATION_NUMPAD:
return "NumPad";
case KeyEvent.KEY_LOCATION_STANDARD:
return "Standard";
case KeyEvent.KEY_LOCATION_UNKNOWN:
default:
return "Unknown";
}
}
};
JTextField text = new JTextField();
text.addKeyListener(listener);
contentPane.add(text, BorderLayout.NORTH);
frame.pack();
frame.show();
}
}
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