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 Java’s primitive data types

Java provides eight in-built data types. In-built means that these data types come with the language. These primitive data types are the topic of this section.

Java’s primitive data types

All of the primitive data types are named using lowercase letters only; for example, int and double. When we create our own data types later on, namely classes, records, and interfaces, we will follow a different naming convention. For example, we may have a class named Person or Cat. This is simply a widely adopted coding convention and the compiler does not distinguish between naming conventions. However, it is very easy to recognize any of the primitive data types as they are always in lowercase letters only. Before we discuss the primitive data types themselves, there are a few important points to make.

Numeric primitive data types are signed

In Java, all numeric primitive data types are represented as a series of bits. In addition...