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In Java, the GUI (Graphical User Interface) is built hierarchically in terms of Components -- one Component nested inside another starting with the smallest Buttons, including Menus, TextFields etc. and ending with full Window divided into Frames, MenuBars etc.
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Not all useful Classes are inherited from Component. For instance Menu inherits from MenuComponent (interface) --> MenuItem --> Menu
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One also needs a set of methods and classes to define the layout of the Components in a particular Panel
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LayoutManager is a java.awt interface with several particular layout strategies implemented as classes under this interface
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The Container class has methods to interact with LayoutManager classes
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