Unit 15 Java Interfaces: Using an Interface to Accomplish a Specific Goal Kirk Scott

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This is an introductory unit. These are the units/chapters belonging to this section of the course: Unit 16, Iterator, book chapter 28 Unit 17, Template, book chapter 21 Unit 18, Strategy, book chapter 23

What will be given next is an extremely brief overview of these topics. Although the patterns are different from each other, they can be viewed as having this broad characteristic in common: They make use of an interface to accomplish their goal Iterator and Template both show how to make use of characteristics of the Java API

Iterator Book definition: The intent of the Iterator pattern is to provide a way to access the elements of a collection sequentially Comment mode on: Large parts of this should already be implicitly clear if you understood for each loops You will see that this pattern is used by the Java API in dealing with collection classes

Template Book definition: The intent of the Template pattern is to implement an algorithm in a method, deferring the definition of some steps of the algorithm so that other classes can redefine them. Comment mode on: You will see that the template pattern is used in the Java API to support the ordering and sorting of objects in collection classes

Strategy Book definition: The intent of Strategy is to encapsulate alternative approaches, or strategies, in separate classes that each implement a common operation. Comment mode on: This pattern is actually quite simple You can have multiple classes implementing the same interface—and thus the same method The implementations of the methods may differ in the classes

In Summary and Mnemonic Devices: Iterator: Remember Java collections Template: Remember Java sorting Strategy: Remember multiple classes implementing the same interface

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