AWT is the basic GUI toolkit shipped with all versions of JDK and is part of the JFC.

It contains classes for implementing various painting styles, complex shapes, fonts and colours.

The java provides Adapter classes that implement the corresponding listener interfaces containing more than one method.

It is one of the most common metaphor used in graphical interface today.

JFC is a suit of libraries design to assist programmers in creating enterprise applications with Java.

It provides an interface that allow assistive technologies to interact and communicate with JFC and AWT components.

Classes that are not named are called anonymous classes and when you declare these classes in a method, don't need a name for these classes.

Inner classes are classes that are declared within other classes and provide additional clarity to programs.

It defines the integer constants that can be used to identify them and is a subclass of InputEvent class.

This class defines integer constants that can be used to identify them and this class is a sub class of ComponentEvent class.

This class represents a FocusEvent which is generated when a component gains or loses input focus and this class is a subclass of ComponentEvent class.

Instance of this class describe text events which are generated by text fields and text areas when characters are entered by a user or program.

The ItemEvent Class represents an ItemEvent which is generated when a check box or a list item is clicked or when a checkable menu item is selected or deselected.

The abstract class InputEvent is a subclass of ComponentEvent and is the superclass for component input events.

Here, a keyEvent is generated when keyboard input occur in the KeyEvent class.