Applied Design Patterns with Java

Creational :: Factory Method (107) {C ch 4}

Example - UML : StraightSeeding

Example - Java :: Patterns\Creational\Factory_Method

Pattern Concept: to provide a simple decision making class that returns one of several possible subclasses of an abstract base class, depending on the data. A single class acts as a 'traffic cop' and decides which subclass of a single hierarchy will be instantiated.

Use a Factory Method pattern when:

• a class can't anticipate which kind of objects that it must create;
• a class uses its subclass to specify which objects it creates;
• there is a need to localize the knowledge of which class gets created.

The example Java program is called 'StraightSeeding'.

The UML diagram is above, and the list of Java files is below:

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