As i was looking through the folder structure of the latest Mustang Update N, a thought occurred to me to look inside the rt.jar. There are some interesting things there, and this entry will look at the class names of Nimbus look and feel.

The Nimbus classes are located in the sun.swing.plaf.nimbus package, and as Jasper already mentioned, most of the code is generated from a designer tool. While the source code of Update N is not yet available, you can still see some quirks of the auto-generated code. Let’s run a simple utility that prints out the top ten list of JRE classes with the longest names:

92:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMaximizeButtonWindowNotFocusedState
91:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneIconifyButtonWindowNotFocusedState
91:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMaximizeButtonWindowMaximizedState
89:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneCloseButtonWindowNotFocusedState
88:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMenuButtonWindowNotFocusedState
78:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMaximizeButtonPainter
77:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneIconifyButtonPainter
75:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneCloseButtonPainter
74:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMenuButtonPainter
61:java_beans_beancontext_BeanContextSupport_PersistenceDelegate

Restricting this list to public classes only (classes with public modifier, which can still be in internal sun packages), we get

78:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMaximizeButtonPainter
77:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneIconifyButtonPainter
75:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneCloseButtonPainter
74:InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMenuButtonPainter
53:OptionPaneOptionPaneMessageAreaOptionPaneLabelPainter
45:MemberSubmissionAddressingWSDLParserExtension
40:ContentHandlerAlreadyRegisteredException
40:SQLIntegrityConstraintViolationException
40:SocketFactoryContactInfoListIteratorImpl
39:SpinnerSpinnerFormattedTextFieldPainter

Obviously, the class name length has nothing to do with the functionality itself. It just shows how easy it is to overlook something when you’re auto-generating code.

Going a little back to Mustang update 2, the first list looks like this:

61:java_beans_beancontext_BeanContextSupport_PersistenceDelegate
59:javax_swing_tree_DefaultMutableTreeNode_PersistenceDelegate
52:javax_swing_DefaultComboBoxModel_PersistenceDelegate
50:javax_swing_border_MatteBorder_PersistenceDelegate
48:java_util_AbstractCollection_PersistenceDelegate
48:javax_swing_DefaultListModel_PersistenceDelegate
47:UnsafeQualifiedStaticCharacterFieldAccessorImpl
47:java_awt_GridBagConstraints_PersistenceDelegate
47:java_awt_font_TextAttribute_PersistenceDelegate
46:javax_swing_ToolTipManager_PersistenceDelegate

and the second list looks like this

40:ContentHandlerAlreadyRegisteredException
40:SQLIntegrityConstraintViolationException
40:SocketFactoryContactInfoListIteratorImpl
38:DOM2DTMdefaultNamespaceDeclarationNode
38:FormatFlagsConversionMismatchException
38:TaggedProfileTemplateFactoryFinderImpl
37:Canonicalizer20010315ExclOmitComments
37:Canonicalizer20010315ExclWithComments
37:IEEE754FloatingPointEncodingAlgorithm
37:RelationServiceNotRegisteredException

So, what is your best example of the longest Java class name that you have ever seen? Can anybody beat 92 characters? .NET comes quite close with 86 characters :)