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copied!<p>Answering my own question:</p> <p><a href="http://download.oracle.com/javase/6/docs/api/java/awt/Container.html#add%28java.awt.Component,%20int%29">Container.add(Component, int)</a> and <a href="http://download.oracle.com/javase/6/docs/api/java/awt/Container.html#setComponentZOrder%28java.awt.Component,%20int%29">Container.setComponentZOrder(Component, int)</a> are virtually identical. The former invokes removeNotify() while the latter does not (for performance reasons).</p> <p>Container-layering only works if <a href="http://download.oracle.com/javase/6/docs/api/javax/swing/JComponent.html#isOptimizedDrawingEnabled%28%29http://download.oracle.com/javase/6/docs/api/javax/swing/JLayeredPane.html#isOptimizedDrawingEnabled%28%29">JComponent.isOptimizedDrawingEnabled()</a> returns false. One implementation that just-so-happens to return false is... you guessed it: <a href="http://download.oracle.com/javase/6/docs/api/javax/swing/JLayeredPane.html">JLayeredPane</a></p> <p>Using Container-layering is discouraged because it can have <a href="http://download.oracle.com/javase/6/docs/api/javax/swing/JLayeredPane.html">unexpected side-effects</a>.</p> <p>Finally, it is worth noting that while Container declares <a href="http://download.oracle.com/javase/6/docs/api/java/awt/Container.html#add%28java.awt.Component,%20int%29">add(Component, int)</a> it doesn't actually paint layered components properly. <a href="http://download.oracle.com/javase/6/docs/api/javax/swing/JComponent.html">JComponent</a> and its subclasses do.</p> <p>Another interesting find: never invoke repaint() on a child of JLayeredPane. This will cause the component to paint itself on top regardless of its z-order. You should only invoke repaint() on the JLayeredPane itself.</p>

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