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

Mastering terminal operations

As we discussed earlier, no streaming happens until the terminal operation executes. This gives the JVM an overall picture of the stream pipeline, thereby enabling efficiencies to be introduced in the background.

A terminal operation can be performed without any intermediate operation but not the other way around. Reductions are a special type of terminal operation where all of the contents of the stream are combined into a single primitive or Object (for example, a Collection).

Table 15.1 represents the terminal operations we will be discussing in this section:

Table 15.1 – Terminal operations

Table 15.1 – Terminal operations

Before we discuss them in turn, a brief discussion regarding the table. Remember, a reduction must look at all elements in the stream and then return a primitive or Object.

Some of these terminal operations, such as allMatch(Predicate), may not look at all of the elements in the stream. For example, let’s say...