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

Comparing String with StringBuilder

When dealing with strings, these two classes are your go-to classes. Their primary difference is that String objects are immutable, whereas StringBuilder objects are mutable. This means that for strings, once you create a String object, you cannot ever change that object. Java might make it look like you changed the object but you haven’t; a new object, reflecting your changes, has been created. StringBuilder objects, on the other hand, are mutable. This means that you are working with one object all the time. We will delve into this with an example later.

Why immutability?

Immutability is attractive from a security perspective as immutable objects cannot be changed. In addition, immutable objects are thread-safe in a multi-threaded environment. In multi-threaded environments, changes to (non-immutable) objects have to be synchronized one at a time so that changes do not interfere with one another Immutable objects are, by definition...