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

Understanding parallel streams

All of the streams so far have been serial streams where the results are ordered. With serial streams, a single thread processes one entry at a time. A parallel stream is processed by multiple threads executing concurrently (running on multiple CPUs). The stream elements are split into substreams, which are processed by multiple instances of the stream pipeline being executed in multiple threads. These partial substream results are then combined into a final result. To execute the substreams in parallel, the streams use the support of Java’s fork/join framework for thread management.

Creating parallel streams

To make a stream a parallel stream is very straightforward. We have two options: we can use the parallelStream() method from the Collection API or the parallel() intermediate operation from the Stream API.

Here are examples of both methods:

Stream<String> parallelFarmAnimals =    List.of("sheep&quot...