You can simply use the mkdirs() method of java.io.File class.

Example:

new File("C:\\Directory1\\Directory2").mkdirs();

Java 8+ version:

import java.nio.file.Paths;
import java.nio.file.Files;

Files.createDirectories(Paths.get("/Your/Path/Here"));

The Files.createDirectories() creates a new directory and parent directories that do not exist. This method does not throw an exception if the directory already exists.

You have to actually call some method to create the directories. Just creating a file object will not create the corresponding file or directory on the file system.

You can use File#mkdirs() method to create the directory: -

theFile.mkdirs();

Difference between File#mkdir() and File#mkdirs() is that, the later will create any intermediate directory if it does not exist.

mkdir -p <path-to-desired-directory>

From the man page:

   -p, --parents
      no error if existing, make parent directories as needed

Thanks to Apache this is super easy.

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;

public class DeleteFolder {

    public static void main(String[] args){
        try {
            File f = new File("/var/www/html/testFolder1");
            FileUtils.cleanDirectory(f); //clean out directory (this is optional -- but good know)
            FileUtils.forceDelete(f); //delete directory
            FileUtils.forceMkdir(f); //create directory
        } catch (IOException e) {
            e.printStackTrace();
        } 
    }

}