Sun changed swing naming convention from com.sun.java.swing to javax.swing.This created a bit of confusion, but you can exploit it to see what versionof swing is installed in a browser, or any other Java enabled environment.
Class swingNewJButtonClass = null;Class swingOldJButtonClass = null;try { swingOldJButtonClass = Class.forName("com.sun.java.swing.JButton"); if(swingOldJButtonClass != null) System.out.println("Old Version of Swing installed"); }catch(ClassNotFoundException e) {}try { swingNewJButtonClass = Class.forName("javax.swing.JButton"); if(swingNewJButtonClass != null) System.out.println("New Version of Swing installed"); } catch(ClassNotFoundException e) {}if(swingOldJButtonClass == null && swingNewJButtonClass == null) System.out.println("No Version of Swing Installed"); 
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