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copied!<p>I preferred to create in my Main Frame class (which extends JFrame) the following function:</p> <pre><code>private void showIntFrame(Class intFrameClass) { JInternalFrame targetFrame = null; int xoff = 0, yoff = 0; for(JInternalFrame jif : jdp.getAllFrames()) { if(jif.getClass().equals(intFrameClass)) targetFrame = jif; if(jif.getLocation().x > xoff) xoff = jif.getLocation().x; if(jif.getLocation().y > yoff) yoff = jif.getLocation().y; } if(targetFrame == null) { try { Constructor<JInternalFrame> c = intFrameClass.getConstructor(MainFrame.class); targetFrame = c.newInstance(MainFrame.this); } catch (Exception ex) { System.err.println("Exception in MainFrame.showIntFrame() while creating new JInternalFrame instance. " + ex.getLocalizedMessage()); ex.printStackTrace(); return; } jdp.add(targetFrame); targetFrame.setLocation(xoff + 30, yoff + 30); } targetFrame.setVisible(true); try { targetFrame.setSelected(true); } catch (PropertyVetoException ex) { System.err.println("PropertyVetoException in MainFrame.showIntFrame() while activating JInternalFrame instance. " + ex.getLocalizedMessage()); } } </code></pre> <p>Here jdp is instance of JDesktopPane, which previously was set as ContentPane of my main JFrame.</p> <p>Because my programs often contain numbers of different classes, inherited from JInternalFrame, it is easier to call this function from event handlers to show new subclass of JInternalFrame.</p> <p>Every subclass of JInternalFrame in my programs have one constructor with one parameter - MainFrame (main JFrame).</p>

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