Guide to the Java Queue Interface
1. Introduction In this tutorial, we’ll be discussing Java’s Queue interface. First, we’ll take a peek at what a Queue does, and some of its core methods. Next, we’ll dive into a […]
Month: July 2021
Introduction to the Java ArrayDeque
1. Overview In this tutorial, we’ll show how to use the Java’s ArrayDeque class – which is an implementation of Deque interface. An ArrayDeque (also known as an “Array Double Ended […]
Guide to DelayQueue
1. Overview In this article, we’ll be looking at the DelayQueue construct from the java.util.concurrent package. This is a blocking queue that could be used in producer-consumer programs. It […]
Guide to the Java TransferQueue
1. Overview In this article, we’ll be looking at the TransferQueue construct from the standard java.util.concurrent package. Simply put, this queue allows us to create programs according to the […]
A Guide to Java SynchronousQueue
1. Overview In this article, we’ll be looking at the SynchronousQueue from the java.util.concurrent package. Simply put, this implementation allows us to exchange information between threads in a thread-safe […]
Guide to java.util.concurrent.BlockingQueue
1. Overview In this article, we will look at one of the most useful constructs java.util.concurrent to solve the concurrent producer-consumer problem. We’ll look at an API […]
Guide to PriorityBlockingQueue in Java
1. Introduction In this article, we’ll focus on the PriorityBlockingQueue class and go over some practical examples. Starting with the assumption that we already know what a Queue is, […]
Using the Map.Entry Java Class
1. Overview We often use maps to store a collection of key-value pairs. Then, at some point, we often need to iterate over them. In this […]
Comparing Two HashMaps in Java
1. Overview In this tutorial, we’re going to explore different ways to compare two HashMaps in Java. We’ll discuss multiple ways to check if two HashMaps are similar. We’ll also […]
Sort a HashMap in Java
1. Introduction In this quick tutorial, we’ll learn how to sort a HashMap in Java. More specifically, we’ll look at sorting HashMap entries by their key or value using: TreeMap […]
Merging Two Maps with Java 8
1. Introduction In this quick tutorial, we’ll demonstrate how to merge two maps using the Java 8 capabilities. To be more specific, we’ll examine different merging scenarios […]
Initialize a HashMap in Java
1. Overview In this tutorial, we’ll learn about various ways of initializing a HashMap in Java. We’ll use Java 8 as well as Java 9. 2. The […]
How to Store Duplicate Keys in a Map in Java?
1. Overview In this tutorial, we’re going to explore the available options for handling a Map with duplicate keys or, in other words, a Map which allows storing multiple […]
Java Map With Case-Insensitive Keys
1. Overview Map is one of the most common data structures in Java, and String is one of the most common types for a map’s key. By default, a map […]
A Guide to Java HashMap
1. Overview In this article, we’ll see how to use HashMap in Java, and we’ll look at how it works internally. A class very similar to HashMap is Hashtable. Please […]
Immutable Map Implementations in Java
1. Overview It is sometimes preferable to disallow modifications to the java.util.Map such as sharing read-only data across threads. For this purpose, we can use either an […]
A Guide to EnumMap
1. Overview EnumMap is a Map implementation that exclusively takes Enum as its keys. In this tutorial, we’ll discuss its properties, common use cases and when we should use it. […]
A Guide to LinkedHashMap in Java
1. Overview In this article, we are going to explore the internal implementation of LinkedHashMap class. LinkedHashMap is a common implementation of Map interface. This particular implementation is a subclass of HashMap and […]
An Introduction to Java.util.Hashtable Class
1. Overview Hashtable is the oldest implementation of a hash table data structure in Java. The HashMap is the second implementation, which was introduced in JDK 1.2. Both classes provide […]
Guide to the ConcurrentSkipListMap
1. Overview In this quick article, we’ll be looking at the ConcurrentSkipListMap class from the java.util.concurrent package. This construct allows us to create thread-safe logic in a lock-free way. […]
