Close one JFrame without closing another?

Question

I want to display two (or more) JFrames at the same time.
When I close one of them (use the default close button), the other frames should still be visible.

How can I do that?

Answer 1

If you do not want your application to terminate when a JFrame is closed, use

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE) 

instead of

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

From the documentation:

• DO_NOTHING_ON_CLOSE (defined in WindowConstants): Don't do anything; require the program to handle the operation in the windowClosing method of a registered WindowListener object.
• HIDE_ON_CLOSE (defined in WindowConstants): Automatically hide the frame after invoking any registered WindowListener objects.
• DISPOSE_ON_CLOSE (defined in WindowConstants): Automatically hide and dispose the frame after invoking any registered WindowListener objects.
• EXIT_ON_CLOSE (defined in JFrame): Exit the application using the System exit method. Use this only in applications.

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This was my answer before the question was clarified, might still be useful:

You can use setVisible(false) on your JFrame if you want to display the same frame again.
Otherwise call dispose() to remove all of the native screen resources.

Answer 2

Does it help you ?

import java.awt.BorderLayout;  import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingUtilities;  public class TwoJFrames {     public static void main(String[] args) {         int nb = 4;         if (args != null && args.length > 0) {             nb = Integer.parseInt(args[0]);         }          final int frameCount = nb;         SwingUtilities.invokeLater(new Runnable() {             public void run() {                 for (int i = 0; i < frameCount; i++) {                     JFrame frame = new JFrame("Frame number " + i);                     frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);                     JPanel p = new JPanel(new BorderLayout());                     p.add(new JLabel("Click on the corner to close..."), BorderLayout.CENTER);                     frame.setContentPane(p);                     frame.setSize(200, 200);                     frame.setLocation(100 + 20 * i, 100 + 20 * i);                     frame.setVisible(true);                 }             }         });      } }