java-tutorials/core-java-modules/core-java-lambdas

Relevant articles:

• Why Do Local Variables Used in Lambdas Have to Be Final or Effectively Final?
• Java 8 – Powerful Comparison with Lambdas
• Functional Interfaces in Java 8
• Lambda Expressions and Functional Interfaces: Tips and Best Practices
• Exceptions in Java 8 Lambda Expressions
• Method References in Java
• The Double Colon Operator in Java 8