question: public TrainingSetPanel ( ) { final JSplitPane split = new JSplitPane ( JSplitPane . HORIZONTAL_SPLIT ) ; JPanel filler1 = new JPanel ( ) ; filler1 . setBackground ( Color . lightGray ) ; JPanel filler2 = new JPanel ( ) ; filler2 . setBackground ( Color . lightGray ) ; split . setLeftComponent ( filler1 ) ; split . setRightComponent ( filler2 ) ; split . setResizeWeight ( .5 ) ; split . setBorder ( null ) ; setLayout ( new GridBagLayout ( ) ) ; GridBagConstraints wholePanelConstraints = new GridBagConstraints ( ) ; wholePanelConstraints . fill = GridBagConstraints . BOTH ; wholePanelConstraints . weightx = 0.5 ; wholePanelConstraints . weighty = 0.5 ; wholePanelConstraints . gridx = 0 ; wholePanelConstraints . gridy = 0 ; add ( split , wholePanelConstraints ) ; }
target:  Create a panel for use in testing.