Simple Java 8 Lambdas

Simple Java 8 Lambdas is a collection of code examples which can help developers quickly start programming lambda expressions in Java 8. Each post illustrates one feature/issue which normally can be completed in 5 minutes. The goal is to make the lambda expression learning simple.

All code used can be downloaded from Github.

1. Lambdas

• Why Lambdas?
• 5 Different Syntax of Lambda Expression

2. Stream

• What is Stream?
• How Functional Interface Works?
• Create a Stream
• Transform Stream
• map()
• filter()
• flatMap()
• Reduce Stream
• Stream.reduce()
• Stream.collect()
• Optional Type
• Primitive Type Streams

3. Goodies of Using Lambdas

• How to write a counter in one line of code?
• Enhanced For-loop vs. forEach()
• How to convert a Stream to an array?
• How to concat 2 Streams?
• How to retrieve a List from a Stream?
• Why Stream.max(Integer::max) compiles?
• Return a Stream vs. Return a Collection

4. Other Features of Java 8

• Default Methods in Java 8