A Practical Guide for Java 8 Lambdas and Streams
A Practical Guide for Java 8 Lambdas and Streams
Mastering Java 8 Lambdas and Streams
About the Book
This book is not the first book about Java 8 lambda expressions and streams, and it's definitely not the last book about lambda expressions and streams. Java 8 is a Java platform upgrade which the community looking forward to for a long time. Lambda expressions and streams quickly gain popularity in Java developers. There are already a lot of books and online tutorials about lambda expressions and streams. This book is trying to explain lambda expressions and streams from a different perspective.
- For lambda expressions, this book explains in details based on JSR 335.
- For streams, this book covers fundamental concepts of Java core library.
- This book provides how-to examples for lambda expressions and streams.
- This book also covers the important utility class Optional.
Lambda expressions and streams are easy to understand and use. This book tries to provide some insights about how to use them efficiently.
About the Author
Bundles that include this book
Table of Contents
- 1. Introduction
-
2. Lambda expressions
- 2.1 Start a thread - A simple example
- 2.2 Functional interfaces
- 2.3 Target typing
- 2.4 Lambda expressions
- 2.5 Lexical scoping
- 2.6 Effectively final local variables
-
2.7 Method references
- 2.7.1 Types of method references
-
2.8 Default interface methods
- 2.8.1 Static interface methods
-
3. Functional interfaces
-
3.1 Functions
-
3.1.1
Function -
3.1.2
BiFunction -
3.1.3
FunctionandBiFunctionwith predefined types
-
3.1.1
-
3.2 Consumers
-
3.2.1
Consumer -
3.2.2
BiConsumer -
3.2.3
Consumerwith predefined types -
3.2.4 Example of using
Consumer
-
3.2.1
-
3.3 Suppliers
-
3.3.1
Supplier -
3.3.2
Supplierwith predefined types
-
3.3.1
-
3.4 Predicates
-
3.4.1
Predicate -
3.4.2
BiPredicate -
3.4.3
PredicateandBiPredicatewith predefined types
-
3.4.1
-
3.5 Operators
-
3.5.1
UnaryOperator -
3.5.2
BinaryOperator - 3.5.3 Operators with predefined types
-
3.5.1
-
3.1 Functions
-
4. Streams
- 4.1 User-specified behavior
-
4.2 Basic stream concepts
- 4.2.1 Sequential or parallel
- 4.2.2 Encounter order
-
4.3 Stream operation characteristics
- 4.3.1 Stateful or stateless
-
4.4
Stream -
4.5
Spliterator-
4.5.1
Spliteratorcharacteristics -
4.5.2
Spliterators for primitive types -
4.5.3
Spliteratorsto createSpliterators - 4.5.4 Late-binding and fail-fast
-
4.5.1
-
4.6
BaseStream -
4.7
StreamSource -
4.8
Streamstatic methods -
4.9 Stream sources
- 4.9.1 Arrays
- 4.9.2 Collections
- 4.9.3 Stream builder
-
4.9.4 I/O channels
- 4.9.4.1 lines
- 4.9.4.2 list
- 4.9.4.3 walk
- 4.9.4.4 find
- 4.10 Examples for stream processing
-
4.11 Stream intermediate operations
-
4.11.1
map -
4.11.2
flatMap -
4.11.3
filter -
4.11.4
distinct -
4.11.5
limit -
4.11.6
skip -
4.11.7
sorted -
4.11.8
peek - 4.11.9 Operations chaining
-
4.11.1
-
4.12 Stream terminal operations
-
4.12.1
forEachandforEachOrdered -
4.12.2
reduce -
4.12.3
maxandmin - 4.12.4 match
- 4.12.5 find
-
4.12.6
toArray -
4.12.7
collect -
4.12.8
Collectors- 4.12.8.1 Collect into collections
-
4.12.8.2
groupingBy -
4.12.8.3
joining -
4.12.8.4
mapping -
4.12.8.5
partitioningBy -
4.12.8.6
counting - 4.12.8.7 averaging
- 4.12.8.8 summing
-
4.12.8.9
maxByandminBy - 4.12.8.10 summarizing
-
4.12.8.11
collectingAndThen -
4.12.8.12
reducing
-
4.12.9 Parallel stream
- 4.12.9.1 Parallel reduction
-
4.12.1
-
4.13 How-tos
-
4.13.1 How to convert a
Collectionto aMap? - 4.13.2 How to filter map entries by keys?
- 4.13.3 How to filter map entries by values?
- 4.13.4 How to group elements by multiple conditions?
- 4.13.5 How to combine multiple collections into a stream?
- 4.13.6 How to convert a stream to another stream with different type?
- 4.13.7 How to find an element in the stream?
- 4.13.8 How to sort map entries?
- 4.13.9 How to do multiple operations on a stream?
- 4.13.10 How to count elements after grouping?
- 4.13.11 Exceptions Handling in Streams
-
4.13.1 How to convert a
-
5. Optional
-
5.1 What’s
Optional -
5.2 Usage of
Optional- 5.2.1 Simple usage
- 5.2.2 Chained usage
- 5.2.3 Functional usage
-
5.3 How-tos
-
5.3.1 How to interact with legacy library code before
Optional? -
5.3.2 How to get value from chained
Optionalreference path? -
5.3.3 How to get first value of a list of
Optionals? -
5.3.4 How to chain method invocations with return value of
Optionalobjects in sequence? -
5.3.5 How to convert an
Optionalobject to a stream? -
5.3.6 How to use
Optionalto check fornulland assign default values?
-
5.3.1 How to interact with legacy library code before
- 5.4 Updates after Java 8
-
5.1 What’s
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