Open only 1 Window at a time!!!

Question

Hy, I have create a JFrame and place 2 JButtons on it (Button A & B). When I click on button A another JFrame opens and when a click on button
B another JFrame opens.
What I want is when I click on button A and that the JFrame for that
button is opened. I can't click on the other button until I have close
the previously opened JFrame.
I do not want to disabled button B.
Is there another way to implement this.
Something like, Focus windows..
can I have the code please for implementing this
thanks

Answer 1

Here is an example:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class GlassPaneTest extends JFrame
     private JPanel mainPanel = new JPanel();
     private BlockableFrame frame1 = null, frame2 = null;
     //Make a glassPane object that is used as glassPane. Simple, eh? =)
     private MouseBlocker glassPane = new MouseBlocker();     
     public GlassPaneTest(){
            //Two frames for the buttons
            frame1 = new BlockableFrame(this);
            frame2 = new BlockableFrame(this);
          //set the glassPane object as our glassPane
          setGlassPane(glassPane);
          //Make some buttons
          JButton butt = new JButton("Open frame 1");
          butt.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent e)
                    //Make the child frame visible
                    frame1.setVisible(true);
                    //Set the glasspane visible, from now on it intercepts all mouse events and consumes them
                    glassPane.setVisible(true);
          mainPanel.add(butt);
          butt = new JButton("Open frame 2");
          butt.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent e)
                    frame2.setVisible(true);
                  glassPane.setVisible(true);
          mainPanel.add(butt);     
        addWindowListener(new WindowAdapter(){
                public void windowClosing(WindowEvent e)
                     System.exit(0);
        //Show the app
          getContentPane().add(mainPanel);
          pack();
          setSize(400,400);
          setLocation(400,100);
          setVisible(true);
     public void unlock(){
          //Hide the glassPane so events can again flow to our parent frame
          glassPane.setVisible(false);
     public static void main(String args[]){
          new GlassPaneTest();
//TestFrame
class BlockableFrame extends JFrame implements WindowListener
     private GlassPaneTest parentFrame;
     public BlockableFrame(GlassPaneTest parent){
          addWindowListener(this);
          parentFrame = parent;
          getContentPane().setLayout(new BorderLayout());
          getContentPane().add(new JLabel("foo"),BorderLayout.CENTER);
          pack();
     public void windowActivated(WindowEvent e){}
     public void windowClosed(WindowEvent e){}
     public void windowDeactivated(WindowEvent e){}
     public void windowDeiconified(WindowEvent e){}
     public void windowIconified(WindowEvent e){}
     public void windowOpened(WindowEvent e){}
     public void windowClosing(WindowEvent e){
          //Unlock the parent frame
          parentFrame.unlock();
//This class is the actual class that consumes mouse events
class MouseBlocker extends JComponent implements MouseListener
     public MouseBlocker() {        
          //Set the wait cursor so we know that events are consumed
          this.setCursor( Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR) );
          setOpaque(false);       
     public void setVisible(boolean isVisible){        
          if(isVisible){            
               addMouseListener(this);
          } else {            
               removeMouseListener(this);
          super.setVisible(isVisible);    
     public void mousePressed(MouseEvent e){
          //Consume the mouse event. This means that event is not passed to the default event handler
          //This way buttons cannot be pressed
          e.consume();
     public void mouseReleased(MouseEvent e){
          e.consume();
     public void mouseClicked(MouseEvent e){
          e.consume();
     public void mouseEntered(MouseEvent e){
          e.consume();
     public void mouseExited(MouseEvent e){
          e.consume();
} Hope it helps!
Br,
J