11. Design Patterns in Java
Design patterns in software engineering offer reusable solutions to common problems encountered during software design. In Java, these patterns facilitate cleaner, modular, and maintainable code through strategic implementations. The chapter outlines three primary categories of design patterns: Creational, Structural, and Behavioral, each offering specific mechanisms for object creation, composition, and interaction.
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Sections
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What we have learnt
- Design patterns are templates for solving common problems.
- There are 3 main categories: Creational, Structural, and Behavioral.
- Common patterns include Singleton, Factory, Adapter, Observer, and Strategy.
- Java’s standard libraries themselves make extensive use of these patterns.
Key Concepts
- -- Design Patterns
- Reusable solutions to common problems in software design that promote best practices.
- -- Creational Patterns
- Patterns related to object creation mechanisms.
- -- Structural Patterns
- Patterns concerned with how classes and objects are composed to form larger structures.
- -- Behavioral Patterns
- Patterns focused on communication between objects.
- -- Singleton Pattern
- Ensures a class has only one instance and provides a global access point to it.
- -- Factory Method Pattern
- Defines an interface for creating objects but allows subclasses to alter the object type created.
- -- Observer Pattern
- Establishes a one-to-many dependency between objects, so when one object changes state, all dependent objects are notified.
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