Question

I am trying to create a directory in Java. I think I have provided correctly all necessary things so that I make the directory, but it is not created. You can see from my code below and the corresponding output that every element from which I compose the path of the new directory should be correct and valid.
It seems, however, that tDir.mkdir(); is not doing anything, and therefore the success variable is always false. I cannot understand why. Thank you in advance.

System.out.println("experimentDir: " + experimentDir);
System.out.println("item.getName(): " + item.getName());
System.out.println("dirName: " + dirName);
String tDirStr = experimentDir + "/" + item.getName() + "All/" 
    + dirName + "DataAll";
System.out.println("tDirStr: " + tDirStr);
File tDir = new File(tDirStr);
if (tDir.exists()) {
      System.out.println("EXISTS!!!");
} else {
      boolean success = tDir.mkdir();
      if(success) {
            System.out.println("Dir created");
      } else {
            System.out.println("No dir created!");
      }

Output:

 experimentDir: /home/Documents/datasets/test-experiments
 item.getName(): PosNegReviews
 dirName: test
 tDirStr: /home/Documents/datasets/test-experiments/PosNegReviewsAll/testDataAll
 No dir created!

Answer 1

If you want to create multiple (nested) directories you should use mkdirs() (note the s).