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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

Working with length and bounds

To avoid getting exceptions, we need to stay within the bounds of the array. Indexes always start at 0, and they end at the length of the array minus 1. If you try to access an element outside this range, you’ll get ArrayIndexOutOfBoundsException. The key to avoiding this is working with the length of the array.

Determining the length of an array

We can determine the length of an array using the length property. The length property returns the number of elements in the array. For example, to get the length of our ages array, we can use the following code:

int arrLength = ages.length;

The length of the array starts counting at 1. Therefore, the length of our ages array is 5. The maximum index is 4.

Dealing with the bounds of an array

If you try to access or modify an array element using an invalid index (an index that is less than 0 or greater than or equal to the array’s length), Java throws ArrayIndexOutOfBoundsException...

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