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

Streams: Advanced Concepts

In Chapter 15, we learned about the fundamentals of streams. We started by discussing what a stream pipeline is by using an analogy of an assembly line. We saw that items only make their way onto the assembly line as and when needed. This is the principle of lazy evaluation. In this analogy, there are several operators that operate on the data (pencils) under the supervision of a supervisor (Java). The supervisor will not allow any work to start until the terminal operation in place. As Java is now aware of the full pipeline, efficiencies can be introduced. Once a pencil has passed an operator, the operator cannot get that pencil back. Thus, streams are different to arrays or Collections in that manner. The pencils can be processed by as many operators as necessary but only one operator is the terminal operation. The other operators represent intermediate operations (a topic in this chapter).

We examined how to create streams. Streams can be created from...