The document introduces the new features in Java SE 8, including lambda expressions and method references to support functional programming. It describes the new Stream API for processing collections in parallel and the DateTime API for representing and manipulating date/time values. Finally, it discusses Nashorn, a new JavaScript engine for the JVM, allowing JavaScript code to interact with Java code. Sample code is provided on GitHub demonstrating the use of each new feature.

1. Java SE 8 New Features
Aymen MASRI @Atos
6th August, 2018
Take a tour of the new features in Java SE 8, the platform designed to support faster and easier Java development. A new
syntax to support lambda expressions in Java code; the new Stream API for processing collections and managing parallel
processing; the DateTime API for representing, managing and calculating date and time values; and Nashorn, a new
engine to better support the use of JavaScript code with the Java Virtual Machine.

2. Table of Contents
2 | Java SE 8 New Features
1
4
3
5 Miscellaneous New Features
2 Processing Collections with Streams
Lambda Expressions and Method Enhancements
New Date and Time API
JavaScript with the Java Virtual Machine

3. Lambda Expressions and
Method Enhancements

4. Lambda Expressions and Method Enhancements
4 | Java SE 8 New Features
Lambda Expression
• Lambda expression are anonymous functions
• Instantiate interfaces with a single method
• Replace more verbose class declarations
Where to Use Lambda Expressions
Lambda expressions can only appear in places where they be assigned to a variable
whose type is a functional interface.

5. Lambda Expressions and Method Enhancements
5 | Java SE 8 New Features
Functional Interfaces
• A functional interface has a single abstract method
• Functional interfaces included with Java runtime
Runnable, Callable, Comparator, TimerTask
•Prior to Java SE 8
Know as "Simple Abstract Method" (SAM) Types

6. Lambda Expressions and Method Enhancements
6 | Java SE 8 New Features
Lambda Expression Syntax
Runnable r = () -> System.out.println("Hello!");
Methode
signature
Methode
Implementation

7. Lambda Expressions and Method Enhancements
7 | Java SE 8 New Features
Sample code (https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lambdas)
• Defining and instantiating a functional interface (FunctionalInterface project)
• Using built-in functional interfaces with lambdas (BuiltInInterfaces project)
• Traversing collections with lambda expressions (TraverseCollection project)
• Filtering collections with predicate interfaces (FilterCollection project)
• Traversing collections with method references (MethodReferences project)
• Implementing default methods in interfaces (DefaultMethods project)
• Implementing static methods in interfaces (StaticMethods project)

8. Lambda Expressions and Method Enhancements
8 | Java SE 8 New Features
Defining and instantiating a functional interface
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lamb
das/FunctionalInterface

9. Lambda Expressions and Method Enhancements
9 | Java SE 8 New Features
Using built-in functional interfaces with lambdas
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lamb
das/BuiltInInterfaces

10. Lambda Expressions and Method Enhancements
10 | Java SE 8 New Features
Traversing collections with lambda expressions
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lamb
das/TraverseCollection

11. Lambda Expressions and Method Enhancements
11 | Java SE 8 New Features
Filtering collections with predicate interfaces
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lamb
das/FilterCollection

12. Lambda Expressions and Method Enhancements
12 | Java SE 8 New Features
Traversing collections with method references
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lamb
das/MethodReferences

13. Lambda Expressions and Method Enhancements
13 | Java SE 8 New Features
Implementing default methods in interfaces
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lamb
das/DefaultMethods

14. Lambda Expressions and Method Enhancements
14 | Java SE 8 New Features
Implementing static methods in interfaces
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/01_Lamb
das/StaticMethods

15. Processing Collections
with Streams

16. Processing Collections with Streams
16 | Java SE 8 New Features
Sample code (https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Streams)
• Traversing collections with streams (TraversingStreams project)
• Creating streams from collections and arrays (CreatingStreams project)
• Aggregating stream values (AggregatingStreams project)

17. Processing Collections with Streams
17 | Java SE 8 New Features
Traversing collections with streams
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Strea
ms/TraversingStreams

18. Processing Collections with Streams
18 | Java SE 8 New Features
Creating streams from collections and arrays
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Strea
ms/CreatingStreams

19. Processing Collections with Streams
19 | Java SE 8 New Features
Aggregating stream values
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Strea
ms/AggregatingStreams

20. New Date and Time API

21. New Date and Time API
21 | Java SE 8 New Features
Sample code (https://github.com/aymenmasri/Java_SE_8_NF/tree/master/03_DateTime)
• Calculating time spans with Instant and Duration (InstantAndDuration project)
• Representing date and time values (DatesAndTimes project)
• Formatting date and time values (FormatDateTime project)
• Supporting time-zone offsets (TimeZones project)

22. New Date and Time API
22 | Java SE 8 New Features
Calculating time spans with Instant and Duration
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Strea
ms/InstantAndDuration

23. New Date and Time API
23 | Java SE 8 New Features
Representing date and time values
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Strea
ms/DatesAndTimes

24. New Date and Time API
24 | Java SE 8 New Features
Formatting date and time values
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Strea
ms/FormatDateTime

25. New Date and Time API
25 | Java SE 8 New Features
Supporting time-zone offsets
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/02_Strea
ms/TimeZones

26. JavaScript with the Java
Virtual Machine

27. JavaScript with the Java Virtual Machine
27 | Java SE 8 New Features
Sample code (https://github.com/aymenmasri/Java_SE_8_NF/tree/master/04_Nashorn)
• Running JavaScript from Java (JSFromJava project)
• Writing JavaScript for Nashorn (JSFromFile project)

28. JavaScript with the Java Virtual Machine
28 | Java SE 8 New Features
Running JavaScript from Java
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/04_Nash
orn/JSFromJava

29. JavaScript with the Java Virtual Machine
29 | Java SE 8 New Features
Writing JavaScript for Nashorn
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/04_Nash
orn/JSFromFile

30. Miscellaneous New
Features

31. Miscellaneous New Features
31 | Java SE 8 New Features
Sample code (https://github.com/aymenmasri/Java_SE_8_NF/tree/master/05_Miscellaneous)
• Joining string values into delimited lists (JoiningStrings project)
• Searching text files with streams (SearchFile project)

32. Miscellaneous New Features
32 | Java SE 8 New Features
Joining string values into delimited lists
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/04_Nash
orn/JSFromFile

33. Miscellaneous New Features
33 | Java SE 8 New Features
Searching text files with streams
Source code
https://github.com/aymenmasri/Java_SE_8_NF/tree/master/04_Nash
orn/SearchFile

34. Miscellaneous New Features
34 | Java SE 8 New Features
Other new features in Java SE 8
• Enhancements in concurrency
• JDBC 4.2
More details
http://www.oracle.com/technetwork/java/javase/8-whats-new-2157071.html

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