@Override public void writeExternal(ObjectOutput out) throws IOException {
  super.writeExternal(out);
  out.writeBoolean(isLeaf);
  out.writeInt(numEntries);
}

@ Override public void writeExternal ( ObjectOutput out ) throws IOException { super . writeExternal ( out ) ; out . writeBoolean ( isLeaf ) ; out . writeInt ( numEntries ) ; }
calls the super method and writes the id of this node , the numentries and the entries array to the specified stream .
