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The Java Workshop

The Java Workshop

By : David Cuartielles , Andreas Göransson, Foster-Johnson
3.1 (8)
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The Java Workshop

The Java Workshop

3.1 (8)
By: David Cuartielles , Andreas Göransson, Foster-Johnson

Overview of this book

Java is a versatile, popular programming language used across a wide range of industries. Learning how to write effective Java code can take your career to the next level, and The Java Workshop will help you do just that. This book is designed to take the pain out of Java coding and teach you everything you need to know to be productive in building real-world software. The Workshop starts by showing you how to use classes, methods, and the built-in Collections API to manipulate data structures effortlessly. You’ll dive right into learning about object-oriented programming by creating classes and interfaces and making use of inheritance and polymorphism. After learning how to handle exceptions, you’ll study the modules, packages, and libraries that help you organize your code. As you progress, you’ll discover how to connect to external databases and web servers, work with regular expressions, and write unit tests to validate your code. You’ll also be introduced to functional programming and see how to implement it using lambda functions. By the end of this Workshop, you’ll be well-versed with key Java concepts and have the knowledge and confidence to tackle your own ambitious projects with Java.
Table of Contents (20 chapters)
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5. Exceptions

Activity 1: Designing an Exception Class Logging Data

Solution

  1. Import the relevant classes needed for this program to work: NoSuchFileException and logging.
    import java.nio.file.NoSuchFileException;
    import java.util.logging.*;
  2. Make your own methods for issuing exceptions, start by creating one for the NullPointerException case.
    public static void issuePointerException() throws NullPointerException {
        throw new NullPointerException("Exception: null pointer");
    }
  3. You will also need a method for the case the file is not found: NoSuchFileException.
    public static void issueFileException() throws NoSuchFileException {
        throw new NoSuchFileException("Exception: file not found");
    }
  4. Back to the Main method, create the logger object that will be reporting the exceptions and their severity level.
    Logger logger = Logger.getAnonymousLogger();
  5. Capture the argument passed to the script via the CLI...
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The Java Workshop
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