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Learn Java with Projects

Learn Java with Projects

By : Dr. Seán Kennedy, Maaike van Putten
4.9 (51)
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Learn Java with Projects

Learn Java with Projects

4.9 (51)
By: Dr. Seán Kennedy, Maaike van Putten

Overview of this book

Learn Java with Projects bridges the gap between introductory Java guides and verbose, theoretical references. This book is crafted to build a strong foundation in Java programming, starting from the Java environment itself. It goes far beyond a superficial review of the topics; it demonstrates, with practical examples, why these fundamentals are crucial for developing a deep understanding of the language. You'll not only learn about classes and objects but also see how these concepts are used in practical scenarios, enhancing your ability to write clean, efficient code. The engaging projects throughout the book provide real-world applications of complex topics, ensuring you can connect theoretical knowledge with practical skills. What makes this book stand out is the expertise of its authors. Seán, a seasoned university lecturer with over 20 years of experience, brings academic rigor and real-world insights, thanks to his work with a prestigious software company. Maaike, a passionate software developer and award-winning trainer, brings hands-on experience and a love for teaching. By the end of this book, you'll not only understand Java's core concepts and the critical advanced ones, but also gain practical experience through projects that mimic real-life challenges.
Table of Contents (22 chapters)
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1
Part 1: Java Fundamentals
9
Part 2: Object-Oriented Programming
15
Part 3: Advanced Topics

Hashing and overriding hashCode()

Hashing is an important concept in Java. It is used to efficiently store and retrieve data in various data structures, such as HashMaps and HashSets. It’s also a very interesting topic. You’ll get quite far without understanding what this does, but at some point, you may wonder about the horrible performance of your HashMap class. And understanding what is going on is not possible without understanding hashing. So, let’s discuss the basic concepts of hashing, the role of the hashCode() method in collections, and best practices for overriding the hashCode() method in your custom classes.

Understanding basic hashing concepts

Hashing is a method that transforms data into a piece of code called a hash code. Think of it like taking a huge pile of books and assigning each book a unique number. A good hash function should give different books different numbers and spread them evenly. This makes it easy to find and organize the books...

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