question: private void addSeparator ( JComponent container , GridBagConstraints c ) { c . gridy = 0 ; c . gridx ++ ; c . gridheight = GridBagConstraints . REMAINDER ; JComponent separator = new JSeparator ( SwingConstants . VERTICAL ) ; Insets tmpInsets = c . insets ; c . insets = new Insets ( SEPARATOR_MARGIN , 0 , SEPARATOR_MARGIN , 0 ) ; container . add ( separator , c ) ; c . gridheight = 1 ; c . insets = tmpInsets ; }
target:  Add a column separator.