e809. 在菜单中使菜单项分开

A separator typically appears as a horizontal line. It is used to group related sets of menu items in a menu.

    // Create a menu
    JMenu menu = new JMenu("Menu Label");

    // Add a menu item
    JMenuItem item1 = new JMenuItem("Item Label");
    menu.add(item1);

    // Add separator
    menu.add(new JSeparator());

    // Add another menu item
    JMenuItem item2 = new JMenuItem("Item Label");
    menu.add(item2);

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