Cómo crear directorios en Java

import java.io.*;
class CreateDirectory
{
public static void main(String args[])
{
try{
String strDirectoy ="test";
String strManyDirectories="dir1/dir2/dir3";

// Create one directory
boolean success = (new File(strDirectoy)).mkdir();
if (success) {
System.out.println("Directory: " + strDirectoy + " created");
}


// Create multiple directories
success = (new File(strManyDirectories)).mkdirs();
if (success) {
System.out.println("Directories: " + strManyDirectories + " created");
}

}catch (Exception e){//Catch exception if any
System.err.println("Error: " + e.getMessage());
}
}
}