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[gui] java.lang.NullPointerException: Cannot invoke "java.awt.Rectangle.equals(Object ...

Program args : -Xms128M -XX:MaxRAMPercentage=70.0 -Dawt.useSystemAAFontSettings=lcd -Dswing.aatext=true -Djava.util.Arrays.useLegacyMergeSort=true -Djdk.util.zip ...
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Exception in thread “AWT-EventQueue-0” java.lang.IllegalArgumentException: Rectangle ...

I have a peculiar situation here in an application I've programmed using a Substance LookAndFeel. In my application, as seen in the screenshot below, I have three JMenus in the MenuBar. The one all ...
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Javaプログラミング／Javaプログラミング関連情報

今回は、実際にJFrameに主なコンポーネントを組み込んで使ってみましょう。 ButtonGroupでは、ラジオボタン以外のものでも ...