You can use File.mkdir() or File.mkdirs() to create a directory. Between the two, the latter method is more tolerant and will create all intermediate directories as needed. Also, since I see that you use "\\" in your question, I would suggest using File.separator for a portable path separator string.

Not sure if such a method exists, but you can certainly define one:

import java.io.File;
import java.util.Arrays;

class Test {

  public static boolean createDirectoriesWithCommonParent(
      File parent, String...subs) {

    parent.mkdirs();
    if (!parent.exists() || !parent.isDirectory()) {
      return false;
    }

    for (String sub : subs) {
      File subFile = new File(parent, sub);
      subFile.mkdir();
      if (!subFile.exists() || !subFile.isDirectory()) {
        return false;
      }
    }
    return true;
  }

  public static void main(String[] args) {
     createDirectoriesWithCommonParent(new File("test/foo"), "a", "b", "c");
  }
}

Use this:

File targetFile = new File("foo/bar/phleem.css");
File parent = targetFile.getParentFile();
if (parent != null && !parent.exists() && !parent.mkdirs()) {
    throw new IllegalStateException("Couldn't create dir: " + parent);
}

While you can just do file.getParentFile().mkdirs() without checking the result, it's considered a best practice to check for the return value of the operation. Hence the check for an existing directory first and then the check for successful creation (if it didn't exist yet).

Also, if the path doesn't include any parent directory, parent would be null. Check it for robustness.

Reference:

• File.getParentFile()
• File.exists()
• File.mkdir()
• File.mkdirs()

new File("/path/directory").mkdirs();

Here "directory" is the name of the directory you want to create/exist.

This is sample program to make directories in java. You can take it as reference and make program to create directories with name current year, current month, current day.

• First take current date using java.util.Date
• Then perform some string operation in date to get names of directories.

• And do some changes in this code as per your need.

  // shows how to create multiple directories in java
  // (multiple directory levels)
  public class JavaCreateMultipleDirectoriesExample
  {
    public static void main(String[] args)
    {
      // the folders "000/111/222" don't exist initially
      File dir = new File("/Users/al/tmp/000/111/222");
  
      // create multiple directories at one time
      boolean successful = dir.mkdirs();
      if (successful)
      {
        // created the directories successfully
        System.out.println("directories were created successfully");
      }
      else
      {
        // something failed trying to create the directories
        System.out.println("failed trying to create the directories");
      }
    }
  }