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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

Examining default and static interface methods

Before Java 8, only abstract methods were allowed in interfaces. This meant that if you introduced a new abstract method to an existing interface, the classes that had already implemented that interface would break. This was inconvenient for not only Java developers but also the designers of Java.

This all changed in Java 8, with the introduction of both default and static methods. One of the primary drivers for introducing default methods was to be able to introduce code into the interface and not break the existing client base. This maintained backward compatibility. In addition, this new code is automatically available to clients implementing that interface.

A primary driver for the introduction of static methods was to keep utility code local to the interface rather than having it in a separate class, which was the case before their introduction.

Let’s discuss them in turn, starting with default methods.

‘...

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