Book Image

Hands-On Design Patterns with Java

By : Dr. Edward Lavieri
2 (1)
Book Image

Hands-On Design Patterns with Java

2 (1)
By: Dr. Edward Lavieri

Overview of this book

Java design patterns are reusable and proven solutions to software design problems. This book covers over 60 battle-tested design patterns used by developers to create functional, reusable, and flexible software. Hands-On Design Patterns with Java starts with an introduction to the Unified Modeling Language (UML), and delves into class and object diagrams with the help of detailed examples. You'll study concepts and approaches to object-oriented programming (OOP) and OOP design patterns to build robust applications. As you advance, you'll explore the categories of GOF design patterns, such as behavioral, creational, and structural, that help you improve code readability and enable large-scale reuse of software. You’ll also discover how to work effectively with microservices and serverless architectures by using cloud design patterns, each of which is thoroughly explained and accompanied by real-world programming solutions. By the end of the book, you’ll be able to speed up your software development process using the right design patterns, and you’ll be comfortable working on scalable and maintainable projects of any size.
Table of Contents (15 chapters)
Free Chapter
Section 1: Introducing Design Patterns
Section 2: Original Design Patterns
Section 3: New Design Patterns

Strategizing with the strategy pattern

The strategy design pattern allows you to individually encapsulate a set of interchangeable algorithms. This results in algorithm variability depending on the calling client. This is similar to method overloading, which allows a class to have more than one method with the same name. The difference between the same-named methods is their argument list.

The strategy design pattern differs from the method overloading example when each algorithm is individually encapsulated.

A sample UML class diagram is provided in the next section.

UML class diagram

As you can see from the UML class diagram, there are multiple options for a single algorithm, represented here with the sampleAlgorithm() method...