To get the most out of this book

You should have a fundamental understanding of the Java language. You should also install the following:

• An IDE (the recommended, but not essential, choice is Apache NetBeans 20.x: https://netbeans.apache.org/front/main/).
• JDK 21 and the Maven latest release.
• Additional third-party libraries will need to be installed to fully follow along with some problems and chapters (nothing too difficult or special).

Download the example code files

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Java-Coding-Problems-Second-Edition. In case there’s an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://packt.link/gbp/9781837633944.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles.

Here is an example: “For instance, let’s add the Patient and Appointment records as well.”

A block of code is set as follows:

if (staff instanceof Resident(String name, Doctor dr)) { 
  return "Cabinet of " + dr.specialty() + ". Doctor: " 
                       + dr.name() + ", Resident: " + name;
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are highlighted:

if (staff instanceof Resident(String name, Doctor dr)) { 
  return "Cabinet of " + dr.specialty() + ". Doctor: " 
                       + dr.name() + ", Resident: " + name;
}

Any command-line input or output is written as follows:

2023-02-07T05:26:17.374159500Z
2023-02-07T05:26:17.384811300Z
2023-02-07T05:26:17.384811300Z

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: “The compiler recognizes a Java record via the record keyword.”