import java.awt.Component; 
import java.awt.Container; 
import java.awt.ContainerOrderFocusTraversalPolicy; 
import java.util.ArrayList; 

public class Focus extends javax.swing.JDialog { 

public Focus(java.awt.Frame parent, boolean modal) { 
super(parent, modal); 
initComponents(); 
init(); 
} 

private void init() { 
jCheckBox1.setText("java: " + System.getProperty("java.version")); 
elementList.add(jButton1); 
elementList.add(jCheckBox1); 
elementList.add(jSpinner1); 
setFocusTraversalPolicy(new CustomFocusTraversalPolicy()); 
} 

private class CustomFocusTraversalPolicy extends ContainerOrderFocusTraversalPolicy { 

@Override 
public Component getComponentAfter(Container focusCycleRoot, Component aComponent) { 
int currentPosition = elementList.indexOf(aComponent); 
currentPosition = (currentPosition + 1) % elementList.size(); 
Component nextC = elementList.get(currentPosition); 
/*	if( nextC == jSpinner1) { 
jSpinner1.requestFocusInWindow(); 
}*/ 
return nextC; 
} 

@Override 
public Component getComponentBefore(Container focusCycleRoot, Component aComponent) { 
int currentPosition = elementList.indexOf(aComponent); 
currentPosition = (elementList.size() + currentPosition - 1) % elementList.size(); 
return (Component) elementList.get(currentPosition); 
} 

@Override 
public Component getFirstComponent(Container cntnr) { 
return (Component) elementList.get(0); 
} 

@Override 
public Component getLastComponent(Container cntnr) { 
return (Component) elementList.get(elementList.size() - 1); 
} 

@Override 
public Component getDefaultComponent(Container cntnr) { 
return (Component) elementList.get(0); 
} 

@Override 
protected boolean accept(Component aComponent) { 
return true; 
} 
} 
/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code"> 
    private void initComponents() { 

        jButton1 = new javax.swing.JButton(); 
        jCheckBox1 = new javax.swing.JCheckBox(); 
        jSpinner1 = new javax.swing.JSpinner(); 

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE); 

        jButton1.setText("jButton1"); 

        jCheckBox1.setText("jCheckBox1"); 

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
        getContentPane().setLayout(layout); 
        layout.setHorizontalGroup( 
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
            .addGroup(layout.createSequentialGroup() 
                .addContainerGap() 
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
                    .addComponent(jButton1) 
                    .addComponent(jCheckBox1) 
                    .addComponent(jSpinner1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
                .addContainerGap(280, Short.MAX_VALUE)) 
        ); 
        layout.setVerticalGroup( 
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
            .addGroup(layout.createSequentialGroup() 
                .addContainerGap() 
                .addComponent(jButton1) 
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
                .addComponent(jCheckBox1) 
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
                .addComponent(jSpinner1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
                .addContainerGap(195, Short.MAX_VALUE)) 
        ); 

        pack(); 
    }// </editor-fold> 

/** 
* @param args the command line arguments 
*/ 
public static void main(String args[]) { 
/* Set the Nimbus look and feel */ 
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
*/ 
try { 
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
if ("Nimbus".equals(info.getName())) { 
javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
break; 
} 
} 
} catch (ClassNotFoundException ex) { 
java.util.logging.Logger.getLogger(Focus.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
} catch (InstantiationException ex) { 
java.util.logging.Logger.getLogger(Focus.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
} catch (IllegalAccessException ex) { 
java.util.logging.Logger.getLogger(Focus.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
} catch (javax.swing.UnsupportedLookAndFeelException ex) { 
java.util.logging.Logger.getLogger(Focus.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
} 
//</editor-fold> 

/* Create and display the dialog */ 
java.awt.EventQueue.invokeLater(new Runnable() { 
@Override 
public void run() { 
Focus dialog = new Focus(new javax.swing.JFrame(), true); 
dialog.addWindowListener(new java.awt.event.WindowAdapter() { 
@Override 
public void windowClosing(java.awt.event.WindowEvent e) { 
System.exit(0); 
} 
}); 
dialog.setVisible(true); 
} 
}); 
} 

    // Variables declaration - do not modify 
    private javax.swing.JButton jButton1; 
    private javax.swing.JCheckBox jCheckBox1; 
    private javax.swing.JSpinner jSpinner1; 
    // End of variables declaration 
ArrayList<Component> elementList = new ArrayList<Component>(); 

}