JCheckBoxMenuItem & Checked
The example has a menu called fruits. When the user clicks the Fruits menu, they can see four Checkbox menu items along with Image Icons. At the bottom of the screen, there is a text field which reports all the checked check boxes. In the above picture, Banana & Cherry check boxes are checked and hence the text field shows Banana and Cherry in it. When the user clicks a menu item, a check mark appears in the check box, and it disappears when the user clicks it again.