Also, in the package com.sun.java.swing.plaf.nimbus, there lies the infamous class InternalFrameInternalFrameTitlePaneInternalFrameTitlePaneMaximizeButtonWindowNotFocusedState (http://codenav.org/code.html?project=/jdk/1.6.0_22&path=...). Quite a precise name for a class that has only 36 lines.

Talking about design patterns, the folks that develop the Spring framework apparently tried to put as many of them together as they could: there is a class named AbstractSingletonProxyFactoryBean (http://static.springsource.org/spring/docs/2.5.x/api/org/spr...) in the aop package. And, the class description is no less than "Convenient proxy factory bean superclass for proxy factory beans that create only singletons".

Take that, GoF.