How to Get the Last Element of a Stream in Java?
1. Overview The Java Stream API was the major feature of the Java 8 release. Streams represent lazily-evaluated sequences of objects and provide a rich, fluent, and monadic-like API. […]
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Iterable to Stream in Java
1. Overview In this short tutorial, let’s convert a Java Iterable object into a Stream and perform some standard operations on it. 2. Converting Iterable to Stream The Iterable interface is designed keeping generality […]
How to Iterate Over a Stream With Indices
1. Overview Java 8 Streams are not collections and elements cannot be accessed using their indices, but there are still a few tricks to make this possible. […]
String Operations with Java Streams
1. Overview Java 8 has introduced a new Stream API that lets us process data in a declarative manner. In this quick article, we would learn how […]
The Difference Between map() and flatMap()
1. Overview map() and flatMap() APIs stem from functional languages. In Java 8, we can find them in Optional, Stream and in CompletableFuture (although under a slightly different name). Streams represent a sequence of […]
Merging Streams in Java
1. Overview In this quick article, we explain different ways of merging Java Streams – which is not a very intuitive operation. 2. Using Plain Java The […]
Custom Thread Pools In Java 8 Parallel Streams
1. Overview Java 8 introduced the concept of Streams as an efficient way of carrying out bulk operations on data. And parallel Streams can be obtained in environments […]
Filtering a Stream of Optionals in Java
1. Introduction In this article, we’re going to talk about how to filter out non-empty values from a Stream of Optionals. We’ll be looking at three different approaches […]
How to Break from Java Stream forEach
1. Overview As Java developers, we often write code that iterates over a set of elements and performs an operation on each one. The Java 8 […]
Java 8 Collectors toMap
1. Overview In this quick tutorial, we’re going to talk about the toMap() method of the Collectors class. We’ll use it to collect Streams into a Map instance. For all the examples […]
Collect a Java Stream to an Immutable Collection
1. Introduction We often wish to convert a Java Stream into a collection. This usually results in a mutable collection, but we can customize it. In this […]
New Stream Collectors in Java 9
1. Overview Collectors were added in Java 8 which helped accumulate input elements into mutable containers such as Map, List, and Set. In this article, we’re going to explore two […]
Guide to Java 8 groupingBy Collector
1. Introduction In this tutorial, we’ll see how the groupingBy collector works using various examples. For us to understand the material covered in this tutorial, we’ll need a […]
Guide to Java 8’s Collectors
1. Overview In this tutorial, we will be going through Java 8’s Collectors, which are used at the final step of processing a Stream. If you […]
Functional Interfaces in Java 8
1. Introduction This tutorial is a guide to different functional interfaces present in Java 8, as well as their general use cases, and usage in […]
Java 8 Stream findFirst() vs. findAny()
1. Overview The Java 8 Stream API introduced two methods that are often misunderstood: findAny() and findFirst(). In this quick tutorial, we’ll look at the difference between these two methods […]
Introduction to Java 8 Streams
1. Overview In this article, we’ll have a quick look at one of the major pieces of new functionality Java 8 had added – Streams. […]
The Java 8 Stream API Tutorial
1. Overview In this comprehensive tutorial, we’ll go through the practical uses of Java 8 Streams from creation to parallel execution. To understand this material, […]
Implementing a Binary Tree in Java
1. Introduction In this tutorial, we’ll cover the implementation of a binary tree in Java. For the sake of this tutorial, we’ll use a sorted binary tree that […]
Hamcrest Collections Cookbook
1. Introduction This cookbook illustrates how to make use of Hamcrest matchers to work with and test collections. The format of the cookbook is example focused and practical […]
