A Guide to Iterator in Java
1. Introduction An Iterator is one of many ways we can traverse a collection, and as every option, it has its pros and cons. It was first […]
Month: July 2021
Java Collections Interview Questions
1. Introduction Java Collections is a topic often brought up on technical interviews for Java developers. This article reviews some important questions that are asked […]
Java Convenience Factory Methods for Collections
1. Overview Java 9 brings the long-awaited syntactic sugar for creating small unmodifiable Collection instances using a concise code one-liner. As per JEP 269, new convenience factory methods […]
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 […]
Finding Max/Min of a List or Collection
1. Introduction A quick intro on how to find the min/max value from a given list/collection with the powerful Stream API in Java8. 2. Find Max in […]
Java – Combine Multiple Collections
1. Overview In this tutorial, we will illustrate how to concatenate multiple collections into one logical collection. We’ll be exploring five different approaches – two […]
Join and Split Arrays and Collections in Java
1. Overview In this quick tutorial, we’ll learn how to join and to split Arrays and Collections in Java, making good use of the new stream support. 2. Join […]
Zipping Collections in Java
1. Introduction In this tutorial, we’ll illustrate how to zip two collections into one logical collection. The “zip” operation is slightly different from the standard “concat” […]
Flattening Nested Collections in Java
1. Overview In this quick article, we’ll explore how to flatten a nested collection in Java. 2. Example of a Nested Collection Suppose we have […]
Shuffling Collections In Java
1. Overview In this quick article, we’ll see how we can shuffle a collection in Java. Java has a built-in method for shuffling List objects — we’ll utilize […]
Sorting in Java
1. Overview This article will illustrate how to apply sorting to Array, List, Set and Map in Java 7 and Java 8. 2. Sorting With Array Let’s start by sorting integer arrays […]
The Difference Between Collection.stream().forEach() and Collection.forEach()
1. Introduction There are several options to iterate over a collection in Java. In this short tutorial, we’ll look at two similar looking approaches — Collection.stream().forEach() and Collection.forEach(). In […]
Arrays.asList vs new ArrayList(Arrays.asList())
1. Overview In this short tutorial, we’ll take a look at the differences between Arrays.asList(array) and ArrayList(Arrays.asList(array)). 2. Arrays.asList Let’s start with the Arrays.asList method. Using this method, we can convert […]
Map to String Conversion in Java
1. Overview In this tutorial, we’ll focus on conversion from a Map to a String and the other way around. First, we’ll see how to achieve these using core […]
How to Convert List to Map in Java
1. Overview Converting List to Map is a common task. In this tutorial, we’ll cover several ways to do this. We’ll assume that each element of the List has an identifier that […]
Convert a Map to an Array, List or Set in Java
1. Overview This short article will show how to convert the values of a Map to an Array, a List or a Set using plain Java as well as a quick Guava based example. 2. Map […]
Converting Between a List and a Set in Java
1. Overview In this quick tutorial, we’ll take a look at the conversion between a List and a Set, starting with Plain Java, using Guava and the Apache Commons Collections library, and […]
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 […]
Converting between an Array and a List in Java
1. Overview In this quick tutorial, we’re going to learn how to convert between an Array and a List using core Java libraries, Guava and Apache Commons […]
A Guide to Concurrent Queues in Java
1. Overview In this tutorial, we’ll walk through some of the main implementations of concurrent queues in Java. For a general introduction to queues, refer […]
