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Removing all duplicates from a List in Java This quick tutorial is going to show you how to clean up the duplicate elements from a List – first using plain Java, then Guava and finally a Java 8 Lambda-based solution. This article is part of the “Java – Back to… Continue Reading java-remove-duplicates-from-list
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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 new collectors added in Java 9: Collectors.filtering and Collectors.flatMapping used in combination with Collectors.groupingBy… Continue Reading java9-stream-collectors
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Java 8 Streams peek() API 1. Introduction The Java Stream API introduces us to a powerful alternative for processing data. In this short tutorial, we’ll focus on peek(), an often misunderstood method. 2. Quick Example Let’s get our hands dirty and try to use peek(). We have a stream of… Continue Reading java-streams-peek-api
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New Features in Java 8 1. Overview In this article, we’ll have a quick look at some of the most interesting new features in Java 8. We’ll talk about: interface default and static methods, method reference and Optional. We have already covered some the features of the Java 8’s release… Continue Reading java-8-new-features
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Introduction to Spliterator in Java 1. Overview The Spliterator interface, introduced in Java 8, can be used for traversing and partitioning sequences. It’s a base utility for Streams, especially parallel ones. In this article, we’ll cover its usage, characteristics, methods and how to create our own custom implementations. 2. Spliterator… Continue Reading java-spliterator
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Converting Between Stream and Array in Java 1. Introduction It’s common to need to convert various dynamic data structures into arrays. In this tutorial, we’ll demonstrate how to convert a Stream to an array and vice versa in Java. 2. Converting a Stream to an Array ==== 2.1. Method Reference… Continue Reading java-stream-to-array
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How to Add a Single Element to a Stream 1. Overview In this quick article, we’re going to take a look at how to add an element to a Java 8 Stream which is not as intuitive as adding an element to a normal collection. 2. Prepending We can easily… Continue Reading java-stream-append-prepend
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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. In this short article, we’re going to look at how to iterate over a Stream… Continue Reading java-stream-indices
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Spring Data Java 8 Support 1. Overview Spring Data now supports core Java 8 features – such as Optional, Stream API and CompletableFuture. In this quick article, we’ll go through some examples of how we can use these with the framework. 2. Optional Let’s start with the CRUD repository methods… Continue Reading spring-data-java-8
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Java Streams vs Vavr Streams 1. Introduction In this article, we’ll be looking at how Stream implementations differ in Java and Vavr. This article assumes familiarity with the basics of both Java Stream API and the Vavr library. 2. Comparison Both implementations represent the same concept of lazy sequences but differ in details.… Continue Reading vavr-java-streams
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