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Arrays in Java: A Reference Guide 1. Introduction In this tutorial, we’ll deep dive into a core concept in the Java language – arrays. We’ll first see what’s an array, then how to use them; overall, we’ll cover how to: Get started with arrays Read and write arrays elements Loop over… Continue Reading java-arrays-guide
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Convert String to Byte Array and Reverse in Java 1. Introduction We frequently need to convert between String and byte array in Java. In this tutorial, we’ll examine these operations in detail. First, we’ll look at various ways to convert a String to a byte array. Then, we’ll look at similar… Continue Reading java-string-to-byte-array
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Sorting Arrays in Java 1. Overview In this tutorial, we’ll discuss common methods to sort arrays in ascending and descending order. We’ll look at using Java’s Arrays class sorting method as well as implementing our own Comparator to order our arrays’ values. 2. Object Definitions Before we begin, let’s quickly define a few… Continue Reading java-sorting-arrays
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Permutations of an Array in Java 1. Introduction In this article, we’ll look at how to create permutations of an array. First, we’ll define what a permutation is. Second, we’ll look at some constraints. And third, we’ll look at three ways to calculate them: recursively, iteratively, and randomly. We’ll focus on… Continue Reading java-array-permutations
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How to Reverse an Array in Java 1. Overview In this quick article, we’ll show how we can invert an array in Java. We’ll see a few different ways to do this using pure Java 8-based solutions – some of those mutate an existing array and some create a new… Continue Reading java-invert-array
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Check if a Java Array Contains a Value 1. Overview In this article, we’ll look at different ways to search an array for a specified value. We’ll also compare how these perform using JMH (the Java Microbenchmark Harness) to determine which method works best. 2. Setup For our examples, we’ll… Continue Reading java-array-contains-value
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Multi-Dimensional Arrays In Java 1. Overview A multi-dimensional array in Java is an array comprising arrays of varying sizes as its elements. It’s also referred to as “an array of arrays” or “ragged array” or “jagged array”. In this quick tutorial, we’ll look more in-depth into defining and working with… Continue Reading java-jagged-arrays
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Converting Between an Array and a Set in Java 1. Overview In this short article we’re going to look at converting between an array and a Set – first using plain java, then Guava and the Commons Collections library from Apache. This article is part of the “Java – Back… Continue Reading convert-array-to-set-and-set-to-array
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Join Array of Primitives with Separator in Java 1. Introduction In this quick tutorial, we’ll learn how to join an array of primitives with a single-character separator in Java. For our examples, we’ll consider two arrays: an array of int and an array of char. 2. Defining the Problem Let’s start… Continue Reading java-join-primitive-array
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Removing the First Element of an Array 1. Overview In this tutorial, we’ll look at how to remove the first element of an array. In addition, we’ll also see how using data structures from the Java Collections Framework makes things even easier. 2. Using Arrays.copyOfRange() First of all, removing an element… Continue Reading java-array-remove-first-element
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