public static void swap(Array array,int left,int right) throws ExpressionException {
  int len=array.size();
  if (len == 0)   throw new ExpressionException("array is empty");
  if (left < 1 || left > len)   throw new ExpressionException("invalid index [" + left + "]","valid indexes are from 1 to " + len);
  if (right < 1 || right > len)   throw new ExpressionException("invalid index [" + right + "]","valid indexes are from 1 to " + len);
  try {
    Object leftValue=array.get(left,null);
    Object rightValue=array.get(right,null);
    array.setE(left,rightValue);
    array.setE(right,leftValue);
  }
 catch (  PageException e) {
    throw new ExpressionException("can't swap values of array",e.getMessage());
  }
}

public static void swap ( Array array , int left , int right ) throws ExpressionException { int len = array . size ( ) ; if ( len == 0 ) throw new ExpressionException ( "array is empty" ) ; if ( left < 1 || left > len ) throw new ExpressionException ( "invalid index [" + left + "]" , "valid indexes are from 1 to " + len ) ; if ( right < 1 || right > len ) throw new ExpressionException ( "invalid index [" + right + "]" , "valid indexes are from 1 to " + len ) ; try { Object leftValue = array . get ( left , null ) ; Object rightValue = array . get ( right , null ) ; array . setE ( left , rightValue ) ; array . setE ( right , leftValue ) ; } catch ( PageException e ) { throw new ExpressionException ( "can't swap values of array" , e . getMessage ( ) ) ; } }
swap to values of the array
