Empty and delete a folder (and subfolders). : Delete « File « Java Tutorial

import java.io.File;

public class Utils {
  /**
   * Empty and delete a folder (and subfolders).
   * @param folder
   *            folder to empty
   */
  public static void rmdir(final File folder) {
      // check if folder file is a real folder
      if (folder.isDirectory()) {
          File[] list = folder.listFiles();
          if (list != null) {
              for (int i = 0; i < list.length; i++) {
                  File tmpF = list[i];
                  if (tmpF.isDirectory()) {
                      rmdir(tmpF);
                  }
                  tmpF.delete();
              }
          }
          if (!folder.delete()) {
            System.out.println("can't delete folder : " + folder);
          }
      }
  }
}

11.79.Delete
	11.79.1.	Deletes the diretory and any files and directories in it recursively.
	11.79.2.	Delete the file or non-empty directory at the supplied path
	11.79.3.	Delete all files under this file and including this file
	11.79.4.	Deletes a directory.
	11.79.5.	Empty and delete a folder (and subfolders).
	11.79.6.	Recursive directory deletion
	11.79.7.	Recursively delete a file and all its contents
	11.79.8.	Recursivly delete directory
	11.79.9.	Remove file or directory
	11.79.10.	Remove a directory and all of its contents.
	11.79.11.	Deletes all files and subdirectories