public static void Run()
{
Folder dir1 = new Folder("dir1"),
dir2 = new Folder("dir2"),
dir3 = new Folder("dir3");
File file1 = new File("file1"),
file2 = new File("file2"),
file3 = new File("file3"),
file4 = new File("file4"),
file5 = new File("file5");
dir1.Add(file1);
dir1.Add(dir2);
dir2.Add(file3);
dir2.Add(file4);
dir2.Add(dir3);
dir3.Add(file5);
dir1.Add(file2);
dir1.ls();
}