P.6. Design Patterns Used in Package java.util
In this section, we use the material on data structures and collections discussed in Chapters 17–19 to identify classes from package java.util that use design patterns.
P.6.1. Creational Design Patterns
We conclude our discussion of creational design patterns by presenting the Prototype design pattern.
Prototype
Sometimes a system must make a copy of an object but will not “know” that object’s class until execution time. For example, consider the drawing program design of Exercise 10.1 in the optional GUI and Graphics Case Study—classes MyLine, MyOval and MyRect represent “shape” classes that extend abstract superclass MyShape. We could modify this exercise to allow the user to create, copy and ...
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