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

Variables and Primitive Data Types

In Chapter 1, we introduced the compiler and the JVM. We learned how to use both of them from the command line when we wrote our first Java program, HelloWorld. We also introduced IntelliJ, a powerful and friendly IDE, and we ran HelloWorld from there as well.

All programming languages require variables and provide in-built primitive data types. They are essential for the operation of even the simplest programs. By the end of this chapter, you will be able to declare variables using Java’s primitive types. In addition, you will understand the differences between the various primitive data types and which ones to use in a given situation.

In this chapter, we are going to cover the following main topics:

  • Understanding and declaring variables
  • Exploring Java’s primitive data types