Tab and Shift-Tab are used for keyboard focus traversal.
To define your own traversal keys: replace or append to a key set via the setFocusTraversalKeys() method of Component.
FORWARD_ TRAVERSAL_KEYS, BACKWARD_TRAVERSAL_KEYS, and UP_CYCLE_TRAVERSAL_KEYS constants of
KeyboardFocusManager are for forward, backward, and up-cycle.
To add the 'A' key as an up-cycle key for a component
import java.awt.AWTKeyStroke;
import java.awt.KeyboardFocusManager;
import java.util.HashSet;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
public class KeyboardFocusManagerDemo {
public static void main(String[] args) {
JFrame aWindow = new JFrame("This is a Border Layout");
aWindow.setBounds(30, 30, 300, 300); // Size
aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel();
p.add(new JTextField(10));
Set set = p.getFocusTraversalKeys(KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS);
set = new HashSet(set);
KeyStroke up = KeyStroke.getKeyStroke("A");
set.add(up);
System.out.println(set);
p.setFocusTraversalKeys(KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, set);
aWindow.add(p);
aWindow.setVisible(true); // Display the window
}
}