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)

Throws and Throw

You can choose not to deal with some caught exceptions in your code at a low level, as described in the previous section. It could be interesting to filter out an exception's parent class and focus on detecting a subclass that might be of more importance to us. The throws keyword is used in the definition of the method you are creating and where the exception may occur. In the following case, which is a modification of Example 09, we should call throws in the definition of main():

import java.nio.file.*;
import java.util.*;
public class Example10 {
    public static void main(String[] args) throws IOException {
        // declare a list that will contain all of the lines
        // inside of the readme.txt file
        List<String> lines = Collections.emptyList();