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  • Book Overview & Buying Learn Java with Projects
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Learn Java with Projects

Learn Java with Projects

By : Dr. Seán Kennedy, Maaike van Putten
4.9 (48)
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Learn Java with Projects

Learn Java with Projects

4.9 (48)
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

Exploring sealed interfaces

In Chapter 9, we learned that sealed classes enable us to scope our inheritance hierarchy by specifying which classes can subtype our class. We used both the sealed and permits keywords as a pair to do this. Once a class has been sealed, each subclass of that class must be sealed, non-sealed, or final – that is, we continue the sealed hierarchy (sealed), end the sealed hierarchy (non-sealed), or end the hierarchy altogether (final).

It is also possible to seal interfaces. We will use the example from Chapter 9 with some small changes. Firstly, Figure 10.11 shows the relevant UML diagram, which will help explain the code:

Figure 10.11 – Sealed interface UML diagram

Figure 10.11 – Sealed interface UML diagram

In this figure, we have an interface, indicated by <<interface>>, called Driveable. In UML, to specify that a class implements an interface, the <<realize>> keyword is used (plus the dashed line with an arrow referring to the...

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