Book Image

The Java Workshop

By : David Cuartielles, Andreas Göransson, Eric Foster-Johnson
4 (2)
Book Image

The Java Workshop

4 (2)
By: David Cuartielles, Andreas Göransson, Eric 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)

Catching Exceptions

As mentioned earlier, there are two ways to handle exceptions: catching and throwing. In this section, we will deal with the first of these methods. Catching an exception requires encapsulating the code that might generate an unwanted result into a specific statement, as shown in the following code snippet:

try {
  // code that could generate an exception of the type ExceptionM
} catch (ExceptionM e) {
  // code to be executed in case of exception happening

We can put this code to test with any of the previous examples. Let's demonstrate how we could stop the exception we found in the first example of the chapter, where we tried to check the length of a string that was initialized to null:

public class Example07 {
    public static void main(String[] args) {
        // declare a string with nothing inside
        String text = null...