@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
  super.readExternal(in);
  this.knnDistance=in.readDouble();
}

@ Override public void readExternal ( ObjectInput in ) throws IOException , ClassNotFoundException { super . readExternal ( in ) ; this . knnDistance = in . readDouble ( ) ; }
calls the super method and reads the knn distance of this entry from the specified input stream .
