34.3. Frameworks
At the risk of oversimplification, a framework is an extendable set of objects for related functions. The quintessential example is a GUI framework, such as Java's AWT or Swing.
The signature quality of a framework is that it provides an implementation for the core and unvarying functions, and includes a mechanism to allow a developer to plug in the varying functions, or to extend the functions.
For example, Java's Swing GUI framework provides many classes and interfaces for core GUI functions. Developers can add specialized widgets by subclassing from the Swing classes and overriding certain methods. Developers can also plug in varying event response behavior to predefined widget classes (such as JButton) by registering listeners ...
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