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    <p>1 - I would rather avoid extending JFrame, since you are not really creating a new class of JFrame.</p> <p>So instead of having your whole class as a subclass of JFrame ( which is not ) you could create instances of them with out adding more behavior.</p> <p>2 - If you want to have two labels reflecting the value of a same "thing" you have to <strong>share</strong> that thing between them ( or have someone to update that value for you ) </p> <p>So, using the famous <a href="http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller" rel="nofollow noreferrer">MVC</a> you'll need.</p> <ul> <li><p><strong>Model</strong> the counter you want to show in both labels.</p></li> <li><p><strong>View</strong> the labels where the model will be shown </p></li> <li><p><strong>Controller</strong> Something that deals between them.</p></li> </ul> <p>They all belong to an application, they are instance attributes of the app. </p> <p>To see how they fit together I'm pasting here the code:</p> <pre><code>import javax.swing.*; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.util.*; // TwoWindows is the Application public class TwoWindows { // shared state ( model ) private int clickCount = 0; // UI private List&lt;JLabel&gt; toUpdate = new ArrayList&lt;JLabel&gt;(); // listener ( listens for clicks on buttons kind of controller ) private ActionListener actionListener = new ActionListener() { // Each time update the UI public void actionPerformed( ActionEvent e ) { clickCount++; for( JLabel label : toUpdate ) { label.setText( "Count: " + ( clickCount ) ); } } }; // Createsa winddow with a label and a button public void showWindow( String named ) { JFrame f = new JFrame( named ); f.add( createButtonAndLabel() ); f.pack(); f.setVisible( true ); } // Creates the label and button and adds this.actionListener // to each button. private JComponent createButtonAndLabel() { JPanel panel = new JPanel(); JLabel label = new JLabel("Count: 0"); JButton clickMe = new JButton("Click me"); // adding the label to a "view" list. toUpdate.add( label ); // adding the listener to each button clickMe.addActionListener( actionListener ); panel.add( label ); panel.add( clickMe ); return panel; } // Run the app public static void main( String [] args ) { TwoWindows t = new TwoWindows(); t.showWindow("A"); t.showWindow("B"); } } </code></pre> <p>This way you could have a shared model and update as many views as you want. </p> <p><a href="http://img387.imageshack.us/img387/1106/capturadepantalla200910d.png" rel="nofollow noreferrer">alt text http://img387.imageshack.us/img387/1106/capturadepantalla200910d.png</a></p>
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    1. POJava GUI: Sharing values across different JFrames
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    1. USOscarRyz
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    1. CO+1 because you use a Mac. Also the answer is good, but mainly the Mac... ;-)
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