public static final String toString(SQLToken start, SQLToken end) { StringBuffer result = new StringBuffer(); for (SQLToken t = start; t != end; t = t.getNext() ) { result.append(t.getImage()); } return result.toString();
public String toString() { return toString(m_first, null);
    public static final String toString(SQLToken start, SQLToken end) {        StringBuffer result = new StringBuffer();        for (SQLToken t = start; t != end; t = t.getNext() ) {            result.append(t.getImage());        }        return result.toString();    }