mkdir() is not creating the new directory

Question

I am using Eclipse and jdk1.7. I am making a basic program using file handling, in which an output directory inside the directory is to be made. But when I run the program,

Answer 1

its obj.mkdirs()

have a look to this:

File  f = new File("non_existing_dir/someDir");
System.out.println(f.mkdir());
System.out.println(f.mkdirs());

The first print won't create a directory and returns false but the second does and returns true