Create new folder using URL for name - Java -

i trying create empty folder name http://www.example.com/, reason can't. tried:

    file dir = new file("http://www.example.com/");     dir.mkdir(); 

but nothing happends. why?

file file = new file("c:\\directorydata"); if (!file.exists()) {     if (file.mkdir()) {         system.out.println("directory created!");     } else {         system.out.println("failed create directory");     } }  file files = new file("c:\\directory2\\subdir\\subdir"); if (files.exists()) {     if (files.mkdirs()) {         system.out.println("directories created!");     } else {         system.out.println("failed create directories!");     } }