question: public void attributeAsClassAt ( int columnIndex ) { Reorder reorder ; String order ; int i ; if ( ( columnIndex > 0 ) && ( columnIndex < getColumnCount ( ) ) ) { addUndoPoint ( ) ; try { order = "" ; for ( i = 1 ; i < m_Data . numAttributes ( ) + 1 ; i ++ ) { if ( i == columnIndex ) { continue ; } if ( ! order . equals ( "" ) ) { order += "," ; } order += Integer . toString ( i ) ; } if ( ! order . equals ( "" ) ) { order += "," ; } order += Integer . toString ( columnIndex ) ; reorder = new Reorder ( ) ; reorder . setAttributeIndices ( order ) ; reorder . setInputFormat ( m_Data ) ; m_Data = Filter . useFilter ( m_Data , reorder ) ; m_Data . setClassIndex ( m_Data . numAttributes ( ) - 1 ) ; } catch ( Exception e ) { e . printStackTrace ( ) ; undo ( ) ; } notifyListener ( new TableModelEvent ( this , TableModelEvent . HEADER_ROW ) ) ; } }
target:  sets the attribute at the given col index as the new class attribute, i.e. it moves it to the end of the attributes