Explanation: Whenever a menu item is selected ActionEvent is generated and an instance of it is
passed to actionPerformed method. In the MyFrame constructor, three listeners are added for all four
menus: item1,item2,item3 and item4. Note that a separate class MMH is created that implements
ActionListener interface. In the constructor of MyFrame when listener is added for the menus using
addActionListener, as an argument, an instance of MMH class is passed. The constructor of MMHclass
takes a reference of the MyFrame class. In the actionPerformed method, the label of the currently
selected menu item ...
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