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

Working with basic I/O operations

We’ll use I/O operations to illustrate how exceptions work. Therefore, before diving into exception handling, we’ll briefly introduce basic I/O operations. There are many ways to do this, but we’ll be using FileReader and FileWriter - FileReader and FileWriter are classes in the java.io package that allow you to read and write characters. We have chosen these two classes because they provide a simple way to work with text files in Java and are commonly used for file I/O operations in the real world as well. First things first, let’s read with FileReader.

Other classes for I/O operations

It is common to use other classes for I/O operations in common situations. For example, if you’re going to read lines from files, you may want to work with BufferedReader instead. This is not the focus of this chapter. We just want to understand enough of I/O operations to demonstrate some real situations for exception handling...