Java KeyboardFocusManager UP_CYCLE_TRAVERSAL_KEYS

public static final int UP_CYCLE_TRAVERSAL_KEYS

/*from   w w  w  .  j a  v  a2s  . co  m*/

import java.awt.AWTKeyStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.KeyboardFocusManager;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;

public class Main extends JFrame {

  public Main() {
    super("Focus Example");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    MyPanel mypanel = new MyPanel();

    JButton button1 = new JButton("One");
    JButton button2 = new JButton("Two");
    JButton button3 = new JButton("Three");
    JButton button4 = new JButton("Four");
    JButton button5 = new MyButton("Five*");
    JButton button6 = new MyButton("Six*");
    JButton button7 = new JButton("Seven");

    mypanel.add(button2);
    mypanel.add(button3);

    JInternalFrame frame1 = new JInternalFrame("Internal Frame 1", true, true, true, true);

    frame1.setBackground(Color.lightGray);
    frame1.getContentPane().setLayout(new GridLayout(2, 3));
    frame1.setSize(300, 200);

    frame1.getContentPane().add(button1);
    frame1.getContentPane().add(mypanel);
    frame1.getContentPane().add(button4);
    frame1.getContentPane().add(button5);
    frame1.getContentPane().add(button6);
    frame1.getContentPane().add(button7);

    JDesktopPane desktop = new JDesktopPane();
    desktop.add(frame1, new Integer(1));
    desktop.setOpaque(true);

    // Now set up the user interface window.
    Container contentPane = getContentPane();
    contentPane.add(desktop, BorderLayout.CENTER);
    setSize(new Dimension(400, 300));
    frame1.setVisible(true);
    setVisible(true);
  }

  public static void main(String[] args) {
    new Main();
  }
}

class MyButton extends JButton {
  public MyButton(String s) {
    super(s);
  }

  public boolean isFocusable() {
    return false;
  }
}

class MyPanel extends JPanel {
  public MyPanel() {
    super(true);
    java.util.Set upKeys = new java.util.HashSet(1);
    upKeys.add(AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_UP, 0));
    setFocusTraversalKeys(KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, upKeys);
  }

  public boolean isFocusCycleRoot() {
    return true;
  }
}