JComponent () { if (myFocusRequest != null) { return myFocusRequest.compute(); } if (myComponent == null) { return null; } Container traversalRoot = myComponent.isFocusCycleRoot() ? myComponent : myComponent.getFocusCycleRootAncestor(); if (traversalRoot == null) { return null; } Component component = traversalRoot.getFocusTraversalPolicy().getDefaultComponent(myComponent); return component instanceof JComponent ? (JComponent)component : null; }