Miscellany

import java.awt.Container;import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.KeyEvent;import javax.swing.AbstractAction;import javax.swing.ActionMap;import javax.swing.InputMap;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JTextField;import javax.swing.KeyStroke;public class Test {  public static void main(String[] args) {    final JFrame frame = new JFrame("test");    JTextField field1 = new JTextField(9);    JTextField field2 = new JTextField(9);    Container pane = frame.getContentPane();    pane.setLayout(new FlowLayout());    pane.add(field1);    pane.add(field2);    frame.pack();    frame.setVisible(true);    InputMap imap = field1.getInputMap();    imap.put(KeyStroke.getKeyStroke(KeyEvent.VK_TAB, java.awt.Event.CTRL_MASK), "next");    imap.put(KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0), "next2");    imap.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), "up");    class NextAction extends AbstractAction {      public void actionPerformed(ActionEvent e) {        System.out.println("Detected action");        JOptionPane.showMessageDialog(frame, "Detected");      }          }    ActionMap amap = field1.getActionMap();    amap.put("next", new NextAction());    amap.put("next2", new NextAction());    amap.put("up", new NextAction());  }}