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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

Interfaces and Abstract Classes

In Chapter 9, we learned about another core pillar of OOP, namely inheritance. We saw that Java uses the extends keyword to define an “is-a” inheritance relationship between the child and the parent class. The subclass inherits functionality from its parent that enables code reuse, a core benefit of inheritance. Java prevents multiple class inheritance by ensuring you can only extend from one class at a time.

We also took a deep dive into the other remaining pillar of OOP, polymorphism. Polymorphism is enabled by subclasses overriding the parent class instance methods. We saw that, regarding the hierarchy, references can point (across) to objects of their own type and (down) to subclass objects. An exception occurs if a reference attempts to point (up) to parent objects in the hierarchy.

Next, we compared and contrasted method overloading and method overriding. In method overriding, the method signatures must match (except for covariant...

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