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)

Reading an Existing File

Reading a file can be done in a simple way. The question is about where you will store the data once you have it. We will work with lists, iterate through the lists, and then print out the results to System.out. The next example uses readAllLines() to open the existing file and reads the contents into the computer's memory, putting them into the fileContent list. After that, we use an iterator to go through each line and send them to the Terminal:

import java.io.IOException;
import java.nio.file.*;
import java.util.List;
public class Example08 {
    public static void main(String[] args) {
        String pathString = System.getProperty("user.home") + "/javaTemp/temp.txt";
        Path pathFile = Paths.get(pathString);
        try {
          ...