Lambda Tutorial

A set of exercises to teach use of Java 8 lambda syntax, and the new Streams API.

To follow the exercises:

fork and clone the repository
ensure you have a correctly configured, lambda-enabled Java build
- Maven can help generate configuration for your favourite IDE, though you will likely have to set the JDK manually
- ensure your cloned project, particularly the class ConfigureYourLambdaBuildOfJdk compiles and runs correctly
navigate to the first exercise, Exercise_1_Test (tests are in src/test/java, in the package org.adoptopenjdk.lambda.tutorial)
read background information in the JavaDoc, and follow instructions, making the test pass
to find solutions check out different branches of the project. Two flavours of solutions are available: what it might have looked like before JDK 8, and what it might look like after JDK 8. Those are in branches solutions-prejava8 and solutions-postjava8 respectively.

Exercises

Internal vs External Iteration (the forEach method)
Filtering and Collecting
Mapping
Method References

[More to come]

Getting Lambda JDK

Early access builds of JDK 8 are available here.

Lamba JDK Build Compatibility

The current tutorial is known to work with the following JDK build:

JDK Build Number	Released On
ea b109	Sep 26, 2013

lambda-tutorial will try to track against the newest version available. If you find that you are working with a newer version of the Lambda JDK and the tutorial does not compile or run, please file an issue.

IDE Setup

IntelliJ IDEA on Ubuntu
IntelliJ IDEA on MacOS
IntelliJ IDEA deutsche Anleitung (u.a. Windows)
Eclipse Kepler 4.3 on Windows

Note: we are hoping the instructions are not too sensitive to the OSes on which they have been performed.

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