java cleardirectory

String[]entries = index.list();
for(String s: entries){
    File currentFile = new File(index.getPath(),s);
    currentFile.delete();
}

boolean deleteDirectory(File directoryToBeDeleted) {
    File[] allContents = directoryToBeDeleted.listFiles();
    if (allContents != null) {
        for (File file : allContents) {
            deleteDirectory(file);
        }
    }
    return directoryToBeDeleted.delete();
}