refactor: use JRootPane#setJMenuBar(menuBar) instead of JPanel#add(menuBar, BorderLayout.NORTH)
refactor: use JRootPane#setJMenuBar(menuBar) instead of JPanel#add(menuBar, BorderLayout.NORTH)

aterai/java-swing-tips,aterai/java-swing-tips,aterai/java-swing-tips,aterai/java-swing-tips