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According to a conversation with Kathy Walrath (Java tutorial author), the JFrame template (and presumably others) should be reviewed for up-to-date coding standards. Kathy commented that using system.Exit is not really preferred now and that it would be a good idea to include things like setDefaultLookAndFeelDecorated(true)
For JFrame, EXIT_ON_CLOSE should be set to window "close operation" property - see issue 32199. As for setting look&feel, there is issue 38043.
Issue 32199 has been fixed. System.exit() is no longer used. All templates provided by form module have been reviewed. As for setDefaultLookAndFeelDecorated(true), I don't think it should set by default. What is the reason to do so? Anything else should be done?
Does not work due to issue 40506.
*** This issue has been marked as a duplicate of 32199 ***