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

Operators and Casting

In Chapter 2, we learned that variables are simply named pigeonholes and contain values. These values vary and Java provides eight primitive data types accordingly. These primitive types cater for whole numbers (byte, char, short, int, and long), decimal numbers (float and double), and the literals true and false (boolean).

We also learned how to declare a variable. As Java is a strongly typed language, this means you must give every variable a data type immediately upon declaration. This is where primitive data types are very useful.

Now that we know how to declare variables, let’s do something interesting with them. By the end of this chapter, you will be able to combine variables using Java’s various operators. In addition, you will understand Java casting, including what it is, and when and why it occurs.

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

  • Learning how Java’s operators cooperate
  • Understanding...