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

calling the only file.mkdirs() often doesn't work. call it in an evaluation such as -

if(file.mkdirs()){ //do something}

Or, in an assignment such as -

 boolean result = file.mkdirs();