public JSONBuffer appendString(Object cont){
  if (stack.empty() || stack.peek() != Operand.ARRAY) {
    throw new JSONException("Appending string outside of array context.");
  }
  addQuotedString(cont);
  addSeparator();
  return this;
}

public JSONBuffer appendString ( Object cont ) { if ( stack . empty ( ) || stack . peek ( ) != Operand . ARRAY ) { throw new JSONException ( "Appending string outside of array context." ) ; } addQuotedString ( cont ) ; addSeparator ( ) ; return this ; }
append a string in quotes
