Elegant Java
Elegant Java
Hands-on Guide to write Clean Code in Java
About the Book
Nothing affects the work of a team as much as bad, illegible, sloppy, and quickly written code that has not been designed carefully. Team dynamics can be improved, requirements can be redefined, and the schedule can be modified. However, if bad code takes over, it becomes more and more a burden for the team.
Programmers should develop all the time. Even if they think that they have sufficient skills and knowledge to move around in current projects, they should not stop there, and it is worthwhile for them to learn new concepts, approaches, language, and frameworks from time to time. Learning should be a journey and not a destination.
This book discusses the best practices of writing better code. It also contains many code examples in Java of increasing complexity.
This is a Forever Edition. That means that the book will see periodic updates, which are free for you. The book will use the latest Java version for the examples provided.
About the Author
Bundles that include this book
Table of Contents
-
Preface
- What about the code examples and typographic conventions?
- Which literature is this book based on?
- Giving feedback?
-
1 Java Best Practices
- 1.1 Avoid instantiation for utility classes
- 1.2 Use immutable objects
- 1.3 Prefer records for immutability
- 1.4 Provide immutable decorators for sensitive mutable classes
- 1.5 Consider using sealed classes and interfaces
- 1.6 Avoid constant interfaces
- 1.7 Avoid global constant classes
- 1.8 Favour composition over inheritance
- 1.9 Consider using lambdas
- 1.10 Use meaningful return types
-
1.11 Use the
@OverrideAnnotation -
1.12 Use the
@FunctionalInterfaceAnnotation -
1.13 Prefer returning Null-Objects over
null -
1.14 Avoid
nullas a method parameter - 1.15 Prefer enhanced loops over for loops
- 1.16 Code against interfaces not implementations
- 1.17 Use existing exceptions
- 1.18 Validate method parameter
- 1.19 Minimize method parameters for improved readability
-
1.20 Prevent
NullPointerExceptionforStringcomparison -
1.21 Safely cast
longtoint - 1.22 Convert integers to floating-point for floating-point math operations
- 1.23 Use generics in favor of raw types
-
1.24 Prefer enums over
intconstants -
1.25 Prefer the
==operator overequalsfor comparing enum values -
1.26 Be aware of the contract between
equalsandhashCode - 1.27 Use text blocks for multi-line strings
- 1.28 Use always braces for the body of all statements
- 1.29 Simplifying boolean expressions
- 1.30 Pre-calculate the length in loops
-
1.31 Avoid constructor instantiation of
String -
1.32 Use
StringBuilderfor concatenation - 1.33 Reduce lookups in collection containers
-
1.34 Instantiate wrapper objects with
valueOf -
1.35 Use
entrySetfor iterating -
1.36 Use
isEmpty()forStringlength - 1.37 Avoid using the default case in switch statements for sealed classes
- 1.38 Prefer method references over lambdas for conciseness
-
1.39 Use the
orElseandorElseGetmethods for optional values -
1.40 Enhance code clarity with
EnumMap
- Notes
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