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copied!<p>Although I haven't tried this, the <a href="http://java.sun.com/javase/6/docs/api/java/awt/Container.html" rel="nofollow noreferrer"><code>Container</code></a> class (which is an ancestor of the <a href="http://java.sun.com/javase/6/docs/api/javax/swing/JDesktopPane.html" rel="nofollow noreferrer"><code>JDesktopPane</code></a> class) contains a <a href="http://java.sun.com/javase/6/docs/api/java/awt/Container.html#getComponentZOrder(java.awt.Component)" rel="nofollow noreferrer"><code>getComponentZOrder</code></a> method. By passing a <a href="http://java.sun.com/javase/6/docs/api/java/awt/Component.html" rel="nofollow noreferrer"><code>Component</code></a> which is in the <code>Container</code>, it will return the z-order of as an <code>int</code>. The <code>Component</code> with the lowest z-order value returned by the method is drawn last, in other words, is drawn on top.</p> <p>Coupling with the <a href="http://java.sun.com/javase/6/docs/api/javax/swing/JDesktopPane.html#getAllFrames()" rel="nofollow noreferrer"><code>JDesktopPane.getAllFrames</code></a> method, which returns an array of <a href="http://java.sun.com/javase/6/docs/api/javax/swing/JInternalFrame.html" rel="nofollow noreferrer"><code>JInternalFrames</code></a>, I would think that one could obtain the z-order of the internal frames.</p> <p><strong>Edit</strong></p> <p>I've actually tried it out and it seems to work:</p> <pre><code>final JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); final JDesktopPane desktopPane = new JDesktopPane(); desktopPane.add(new JInternalFrame("1") { { setVisible(true); setSize(100, 100); } }); desktopPane.add(new JInternalFrame("2") { { setVisible(true); setSize(100, 100); } }); desktopPane.add(new JInternalFrame("3") { JButton b = new JButton("Get z-order"); { setVisible(true); setSize(100, 100); getContentPane().add(b); b.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { JInternalFrame[] iframes = desktopPane.getAllFrames(); for (JInternalFrame iframe : iframes) { System.out.println(iframe + "\t" + desktopPane.getComponentZOrder(iframe)); } } }); } }); f.setContentPane(desktopPane); f.setLocation(100, 100); f.setSize(400, 400); f.validate(); f.setVisible(true); </code></pre> <p>In the above example, a <code>JDesktopPane</code> is populated with three <code>JInternalFrame</code>s with the third one having a button which will output a list of <code>JInternalFrame</code>s and its z-order to <code>System.out</code>.</p> <p>An example output is the following:</p> <pre><code>JDesktopPaneTest$3[... tons of info on the frame ...] 0 JDesktopPaneTest$2[... tons of info on the frame ...] 1 JDesktopPaneTest$1[... tons of info on the frame ...] 2 </code></pre> <p>The example uses a lot of anonymous inner classes just to keep the code short, but an actual program probably should not do that.</p>

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