Delete a folder in java

deleteDirRecursive.java

public static void deleteDirRecursive(File folder) {
    File[] files = folder.listFiles();
    if (files != null) {
        for (File f : files) {
            if (f.isDirectory()) {
                deleteDirRecursive(f);
            } else {
                f.delete();
            }
        }
    }
    folder.delete()
}