Java JTextField set focus traversal keys

import java.awt.BorderLayout;
import java.awt.KeyboardFocusManager;
import java.util.HashSet;
import java.util.Set;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.KeyStroke;

public class Main {
   public static void main(String[] argv) throws Exception {
      JComponent component = new JTextField();

      Set set = new HashSet(component.getFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS));

      set.add(KeyStroke.getKeyStroke("F2"));
      component.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, set);
      // ww  w  .  j a  va  2s .  co m
      JFrame f = new JFrame();

      f.add(component, BorderLayout.NORTH);
      
      f.add(new JTextField(10), BorderLayout.SOUTH);
      f.setSize(300, 300);
      f.setVisible(true);

   }
}