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JAVA, how to realize that after clicking different menu items, the panel displays different contents to realize different functions?
You need to add a listener similar to ActionListener to each menu item to react to mouse actions. Please refer to the JAVA tutorial on GUI for details.
For example: j menuitem1.addactionlistener (project handler);
ItemHandler is a listener that I wrote myself.
It is best to make JMenuItem into an array, which can save code.