Practical Design Patterns for Java Developers: Hone your software design skills by implementing popular design patterns in Java

Cover
Title Page
Copyright and Credits
Foreword
Contributors
Table of Contents
Preface
Part 1: Design Patterns and Java Platform Functionalities
Chapter 1: Getting into Software Design Patterns
	Technical requirements
	Code – from symbols to program
	Examining OOP and APIE
		Only exposing what’s required – encapsulation
		Inevitable evolution – inheritance
		Behavior on demand – polymorphism
		Standard features – abstraction
		Gluing parts to APIE
	Understanding the SOLID design principles
		The single-responsibility principle (SRP) – the engine is just an engine
		The open-closed principle (OCP)
		The Liskov Substitution Principle (LSP) – substitutability of classes
		The interface segregation principle (ISP)
		The dependency inversion principle (DIP)
	Significance of design patterns
	Reviewing what challenges design patterns solve
	Summary
	Questions
	Further reading
Chapter 2: Discovering the Java Platform for Design Patterns
	Technical requirements
	Knocking on Java’s door
	Exploring the model and functionality of the Java platform
		The JDK
		The JRE
		The JVM
	Reviewing GC and the Java memory model
		The JMM
		GC and automatic memory management
	Examining the core Java APIs
		Primitive data types and wrappers
		Working with the String API
		Introducing arrays
		Discovering a collection framework
		Math APIs
	Functional programming and Java
		Introducing lambdas and functional interfaces
		Using functional interfaces in lambda expressions
	Getting to grips with the Java Module System
	A quick review of Java features from 11 to 17+
		The local variable syntax for lambda parameters (Java SE 11, JEP-323)
		Switch expressions (Java SE 14, JEP-361)
		Text blocks (Java SE 15, JEP-378)
		Pattern matching for instanceof (Java SE 16, JEP-394)
		Records (Java SE 16, JEP-395)
		Sealed classes (Java SE 17, JEP-409)
		UTF-8 by default (Java SE 18, JEP-400)
		Pattern matching for switch (Java SE 18, Second Preview, JEP-420)
	Understanding Java concurrency
		From a basic thread to executors
		Executing tasks
	Summary
	Questions
	Further reading
Part 2: Implementing Standard Design Patterns Using Java Programming
Chapter 3: Working with Creational Design Patterns
	Technical requirements
	It all starts with a class that becomes an object
	Creating objects based on input with the factory method pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Creating objects from different families using the abstract factory pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Instantiating complex objects with the builder pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Cloning objects with the prototype pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Ensuring only one instance with the singleton pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Improving performance with the object pool pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Initiating objects on demand with the lazy initialization pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Reducing class dependencies with the dependency injection pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Summary
	Questions
	Further reading
Chapter 4: Applying Structural Design Patterns
	Technical requirements
	Incompatible object collaboration with the adapter pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Decoupling and developing objects independently with the bridge pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Treating objects the same way using the composite pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Extending object functionality by using the decorator pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Simplifying communication with the facade pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Using conditions to select desired objects with the filter pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Sharing objects across an application with the flyweight pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Handling requests with the front-controller pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Identifying instances using the marker pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Exploring the concept of modules with the module pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Providing a placeholder for an object using the proxy pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Discovering multiple inheritance in Java with the twin pattern
		Motivation
		Sample code
		Conclusion
	Summary
	Questions
	Further reading
Chapter 5: Behavioral Design Patterns
	Technical requirements
	Limiting expensive initialization using the caching pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Handling events using the chain of responsibility pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Turning information into action with the command pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Giving meaning to the context using the interpreter pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Checking all the elements with the iterator pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Utilizing the mediator pattern for information exchange
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Restoring the desired state with the memento pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Avoiding a null pointer exception state with the null object pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Keeping all interested parties informed using the observer pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Dealing with instance stages by using the pipeline pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Changing object behavior with the state pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Using the strategy pattern to change object behavior
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Standardizing processes with the template pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Executing code based on the object type using the visitor pattern
		Motivation
		Finding it in the JDK
		Sample code
		Conclusion
	Summary
	Questions
	Further reading
Part 3: Other Essential Patterns and Anti-Patterns
Chapter 6: Concurrency Design Patterns
	Technical requirements
	Decoupling a method execution with an active object pattern
		Motivation
		Sample code
		Conclusion
	Non-blocking tasks using async method invocation pattern
		Motivation
		Sample code
		Conclusion
	Delay execution until the previous task is completed with the balking pattern
		Motivation
		Sample code
		Conclusion
	Providing a unique object instance with a double-checked locking pattern
		Motivation
		Sample code
		Conclusion
	Using purposeful thread blocking via a read-write lock pattern
		Motivation
		Sample code
		Conclusion
	Decoupling the execution logic with a producer-consumer pattern
		Motivation
		Sample code
		Conclusion
	Executing isolated tasks with the scheduler pattern
		Motivation
		Sample code
		Conclusion
	Effective thread utilization using a thread-pool pattern
		Motivation
		Sample code
		Conclusion
	Summary
	Questions
	Further reading
	Answers
Chapter 7: Understanding Common Anti-Patterns
	Technical requirements
	What anti-patterns are and how to identify them
		Theoretical principles challenges
		Collecting technical debt as a bottleneck
		Inappropriately squeezing the capabilities of the Java platform
		Selecting the right tool
		Conclusion of the code smell anti-pattern
	Examining typical software anti-patterns
		Spaghetti code
		Cut and paste programming
		Blob
		Lava flow
		Functional decomposition
		Boat anchor
		Conclusion
	Understanding software architecture anti-patterns
		Golden hammer
		Continuous obsolescence
		Input kludge
		Working in a minefield
		Ambiguous viewpoint
		Poltergeists
		Dead end
		Conclusion
	Summary
	Further reading
Assessments
Index
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