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

for loops

The for loop comes in two styles: the traditional for loop and the enhanced for loop. The enhanced for loop is also known as the for-each loop and is specifically designed to work with arrays and collections. We will start by examining the traditional for loop.

Traditional for loop

This type of for loop is extremely useful when you know how many iterations you wish to perform beforehand. Its syntax is detailed in Figure 5.8.

Figure 5.8 – The traditional for loop

Figure 5.8 – The traditional for loop

The code block in the preceding figure is optional. We could simply control one statement, such as System.out.println("Looping");, and omit {}. The for header is the section inside (). It consists of three parts, delimited by semi-colons:

  • Initialization section: This is where you initialize your loop control variables. The variables declared here have the scope of the loop block only. Traditionally, the variables declared here are named i, j, k, and so forth...