import java.io.File;

public class CreateDirectory {
    public static void main(String[] args) {
        File dir = new File("myFolder");
        if (dir.mkdir()) {
            System.out.println("Directory created.");
        } else {
            System.out.println("Directory not created or already exists.");
        }
    }
}

File dir = new File("parent/child/grandchild");
if (dir.mkdirs()) {
    System.out.println("All directories created.");
}

File dir = new File("myFolder");
String[] list = dir.list();

if (list != null) {
    for (String name : list) {
        System.out.println(name);
    }
}

File f = new File("myFolder/data.txt");

if (f.isFile()) {
    System.out.println("It is a file.");
} else if (f.isDirectory()) {
    System.out.println("It is a directory.");
}

File f = new File("myFolder/data.txt");
if (f.delete()) {
    System.out.println("File deleted.");
}

File d = new File("myFolder");
if (d.delete()) {
    System.out.println("Directory deleted.");
}

public class DeleteDirectory {
    public static void deleteFolder(File file) {
        File[] files = file.listFiles();
        if (files != null) {
            for (File f : files) {
                deleteFolder(f); // recursion
            }
        }
        file.delete();
    }

    public static void main(String[] args) {
        File dir = new File("myFolder");
        deleteFolder(dir);
        System.out.println("Directory and contents deleted.");
    }
}