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

Learning how Java’s operators cooperate

Java provides numerous operators for us to work with. By way of definition, if we have an expression 3 + 4, the + is the operator, whereas 3 and 4 are the operands. Since + has two operands, it is known as a binary operator.

Before we discuss the operators themselves, we must first discuss two important features relating to Java operators, namely order of precedence and associativity.

Order of precedence

Order of precedence specifies how operands are grouped with operators. This becomes important when you have shared operands in a complex expression. In the following code segment, we have an expression of 2 + 3 * 4, where * represents multiplication and + represents addition:

int a = 2 + 3 * 4;System.out.println(a);

In the preceding code, 3 is shared by both 2 and 4. So, the question arises, do we group 3 with 2, where the expression is (2 + 3) * 4, giving us 20; or do we group 3 with 4, where the expression is 2 + (3 *...