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 operators

Operators can be grouped into the following categories:

  • Unary operators
  • Arithmetic operators
  • Relational operators
  • Logical operators
  • Ternary operator
  • Compound assignment operators

We will now discuss each category in turn.

Unary operators

Unary operators have only one operand, hence the term unary. Let’s examine them.

Prefix and postfix unary operators

++ and -- denote these operators and they increment and decrement by 1, respectively. If the operator appears before the variable, it is known as prefix, while if the operator appears after the variable, it is called postfix. For example, ++x is prefix increment, whereas y-- is postfix decrement.

Depending on whether ++ or -- appears before or after the variable can, in some situations, affect the overall expression. This is best explained with a code sample, as shown in Figure 3.1:

Figure 3.1 – Prefix and postfix increment and decrement operators

Figure 3.1 – Prefix and postfix...