Book Image

Learn Java with Projects

By : Dr. Seán Kennedy, Maaike van Putten
5 (3)
Book Image

Learn Java with Projects

5 (3)
By: Dr. Seán Kennedy, Maaike van Putten

Overview of this book

Learn Java with Projects stands out in the world of Java guides; while some books skim the surface and others get lost in too much detail, this one finds a nice middle ground. You’ll begin by exploring the fundamentals of Java, from its primitive data types through to loops and arrays. Next, you’ll move on to object-oriented programming (OOP), where you’ll get to grips with key topics such as classes, objects, encapsulation, inheritance, polymorphism, interfaces, and more. The chapters are designed in a way that focuses on topics that really matter in real-life work situations. No extra fluff here, so that you get more time to spend on the basics and form a solid foundation. As you make progress, you’ll learn advanced topics including generics, collections, lambda expressions, streams and concurrency. This book doesn't just talk about theory—it shows you how things work with little projects, which eventually add up to one big project that brings it all together. By the end of this Java book, you’ll have sound practical knowledge of Java and a helpful guide to walk you through the important parts of Java.
Table of Contents (22 chapters)
1
Part 1: Java Fundamentals
9
Part 2: Object-Oriented Programming
15
Part 3: Advanced Topics

Queue

The last in line is the Queue interface. It’s part of the Java collections framework and allows FIFO data storage. The head of the queue is the oldest element, and the tail is the newest element. Queues are useful for processing tasks in the order they are received. There is also a sub-interface called Deque, which is a special type of queue that allows you to get elements from both the head and the tail of the queue. This is why it can also be used for LIFO systems.

We’ll only briefly deal with the different types of queues since this is the collection that’s typically least used in the wild.

Queue implementations

The Queue interface extends the Collection interface. There are several implementations, with some of the most common ones being PriorityQueue, LinkedList, and ArrayDeque. The Deque interface, which extends the Queue interface, adds support for double-ended queues, allowing the insertion and removal of elements from both ends of the queue...