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The Most Used Stream Operations in Java With Examples

Sat, 12 Aug 2023 00:00:00 +0000

Stream operations were introduced in Java 8 and they allow you to manipulate collections of data in a concise and functional way. A stream can be seen as a sequence of elements that you can perform various operations on, such as filtering, mapping, or reducing.

This article serves as a comprehensive guide to the most commonly used stream operations, with clear explanations and practical examples.

Setting up and Creating Streams

To work with stream operations, you need to create a stream first. Streams can be created from various data sources, including collections, arrays, or input/output channels. For example, to create a stream from a list, you can use the stream() method:

A Deep Dive into the flatMap Operation of the Stream API in Java with Examples

Thu, 10 Aug 2023 00:00:00 +0000

The flatMap operation is an intermediate operation provided by the Stream API, which allows you to transform each element of a stream into zero or more elements and then flatten the resulting elements into a single stream. It’s useful to use with nested data structures, such as lists within lists and effectively “flattening” them into a more manageable format.

In this article we are going to explain how this operation works internally and give some examples.

Difference between Map and FlatMap in Java

Thu, 18 Feb 2021 00:00:00 +0000

Photo by Clément Hélardot on Unsplash

The Stream API of Java 8 provides two intermediate stream operations used to perform actions on stream elements and return a stream as an output: map and flatMap. In this article, we are going to take a look at these two methods and explain the difference between them with examples.

Map function

The map function takes a Function as a parameter and applies it to all the elements of the stream. The result will be a stream of the result of the function applied to each element of the initial stream. There is a one-to-one mapping between the input and the output elements.