book

Modern Java Recipes

by Ken Kousen

August 2017

Intermediate to advanced

319 pages

6h 50m

English

O'Reilly Media, Inc.

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Related skills

Java

Associated roles

Android developer
Backend developer
Java developer
QA engineer

Modern JavaWho Should Read This BookHow This Book Is OrganizedConventions Used in This BookUsing Code ExamplesO’Reilly SafariHow to Contact UsAcknowledgments
1.1. Lambda Expressions1.2. Method References1.3. Constructor References1.4. Functional Interfaces1.5. Default Methods in Interfaces1.6. Static Methods in Interfaces
2.1. Consumers2.2. Suppliers2.3. Predicates2.4. Functions
3.1. Creating Streams3.2. Boxed Streams3.3. Reduction Operations Using Reduce3.4. Check Sorting Using Reduce3.5. Debugging Streams with peek3.6. Converting Strings to Streams and Back3.7. Counting Elements3.8. Summary Statistics3.9. Finding the First Element in a Stream3.10. Using anyMatch, allMatch, and noneMatch3.11. Stream flatMap Versus map3.12. Concatenating Streams3.13. Lazy Streams
4.1. Sorting Using a Comparator4.2. Converting a Stream into a Collection4.3. Adding a Linear Collection to a Map4.4. Sorting Maps4.5. Partitioning and Grouping4.6. Downstream Collectors4.7. Finding Max and Min Values4.8. Creating Immutable Collections4.9. Implementing the Collector Interface
5.1. The java.util.Objects Class5.2. Lambdas and Effectively Final5.3. Streams of Random Numbers5.4. Default Methods in Map5.5. Default Method Conflict5.6. Iterating Over Collections and Maps5.7. Logging with a Supplier5.8. Closure Composition5.9. Using an Extracted Method for Exception Handling5.10. Checked Exceptions and Lambdas5.11. Using a Generic Exception Wrapper
6.1. Creating an Optional6.2. Retrieving Values from an Optional6.3. Optional in Getters and Setters6.4. Optional flatMap Versus map6.5. Mapping Optionals
7.1. Process Files7.2. Retrieving Files as a Stream7.3. Walking the Filesystem7.4. Searching the Filesystem
8.1. Using the Basic Date-Time Classes8.2. Creating Dates and Times from Existing Instances8.3. Adjusters and Queries8.4. Convert from java.util.Date to java.time.LocalDate8.5. Parsing and Formatting8.6. Finding Time Zones with Unusual Offsets8.7. Finding Region Names from Offsets8.8. Time Between Events

9.1. Converting from Sequential to Parallel Streams9.2. When Parallel Helps9.3. Changing the Pool Size9.4. The Future Interface9.5. Completing a CompletableFuture9.6. Coordinating CompletableFutures, Part 19.7. Coordinating CompletableFutures, Part 2
10.1. Modules in Jigsaw10.2. Private Methods in Interfaces10.3. Creating Immutable Collections10.4. Stream: ofNullable, iterate, takeWhile, and dropWhile10.5. Downstream Collectors: filtering and flatMapping10.6. Optional: stream, or, ifPresentOrElse10.7. Date Ranges
BackgroundWhat Everybody KnowsWhat Some Developers Don’t RealizeWildcards and PECSExamples from the Java 8 APISummary

Overview

The introduction of functional programming concepts in Java SE 8 was a drastic change for this venerable object-oriented language. Lambda expressions, method references, and streams fundamentally changed the idioms of the language, and many developers have been trying to catch up ever since. This cookbook will help. With more than 70 detailed recipes, author Ken Kousen shows you how to use the newest features of Java to solve a wide range of problems.

For developers comfortable with previous Java versions, this guide covers nearly all of Java SE 8, and includes a chapter focused on changes coming in Java 9. Need to understand how functional idioms will change the way you write code? This cookbook—chock full of use cases—is for you.

Recipes cover: