public final void init(final String current_key){
  key=current_key + System.currentTimeMillis();
  final File f=new File(temp_dir);
  if (!f.exists()) {
    f.mkdirs();
  }
}

public final void init ( final String current_key ) { key = current_key + System . currentTimeMillis ( ) ; final File f = new File ( temp_dir ) ; if ( ! f . exists ( ) ) { f . mkdirs ( ) ; } }
init method to pass in values for temp directory , unique key , etc so program knows where to store files .
