Java 8 features : Complete Guide

In this article, we will focus on the key Java 8 features.

Java 8 features

Why Java 8 is a major release?

Java 8 has been a very major release as far as java programming language is concerned, since it’s very inception.Java 8 has injected functional programming aspects into java with the introduction of lambda expressions.

Let’s delve ourselves into the realm of important Java 8 features.

forEach : Iteration Over Collections and Streams

Java 8 introduced forEach for iterating over collections and streams with much ease.

Please visit forEach for more details.

Functional Interfaces and Lambda Expressions

This is one of the key Java 8 features.

The first step towards functional programming paradigm in Java. Lambda expressions in short provide for inline implementation of functional interfaces.

Please visit Lambda Expressions for more details.

default and static methods in Interfaces

With Java 8, Interfaces are provided with ability to have method with implementation.

Please visit default and static methods in Interfaces for more understanding of this feature.

Stream API

Stream was introduced to perform filter/map/reduce like operations with the collection. Stream API will allow sequential as well as parallel execution.

Please visit the below links for better understanding of Stream API.

Java 8 Stream

Java 8 Stream continues…

Stream: More APIs

Stream: Terminal and Non-Terminal Operations

Parallel Streams in Java 8

flatMap in Stream


Metaspace is a new memory space which  has replaced PermGen.

Please visit Metaspace for more details.


Optional is a single-value container that either contains a value or doesn’t (it is then said to be “empty”).

Please visit Optional for more details.


StringJoiner was introduced in Java 8. It joins String separated by a delimiter, starting with a supplied prefix and ending with a supplied suffix.

Please visit StringJoiner for more information.

Date Time API

Java 8 Date Time API was designed to overcome all the flaws in the legacy date time implementations.

Please visit Date Time API for more info.

Conclusion: Java 8 features

In this article, we covered the key Java 8 features like Functional Interfaces, Lambda Expressions, Stream API, forEach, static and default methods in Interface, Date Time API, StringJoiner,Optional, MetaSpace. Understanding of these important Java 8 features will help you improve your Java coding skills.

Also Read : Top 10 Java 9 Features: Comprehensive Insights

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