To start the project, we will use the directory structure and pom.xml that was created by Maven itself when we started with the following command line:

$ mvn archetype:generate

It created the directories, the pom.xml file, and an App.java file. Now, we will extend this project by creating new files. We will code the sorting algorithm first in the packt.java9.by.example.stringsort package:

When we create the new package in the IDE, the editor will automatically create the stringsort subdirectory under the already existing src/main/java/packt/java9/by/example directory:

Creating the new Sort class using the IDE will also automatically create a new file named Sort.java in this directory, and it will fill in the skeleton of the class:

package packt.java9.by.example.stringsort; 

public class Sort { 
}

We will now have App.java containing the following code:

package packt.java9.by.example; 

public class App  
{ 
    public static void main( String[] args ) 
    { ...