public void addVarbind(SnmpVarBind varbind){
  if (sublist == null)   sublist=new Vector<>();
  sublist.addElement(varbind);
}

public void addVarbind ( SnmpVarBind varbind ) { if ( sublist == null ) sublist = new Vector < > ( ) ; sublist . addElement ( varbind ) ; }
adds a varbind in this node sublist .
