public boolean contains(Object o) {
        if ((m_first != null) && (m_first.equals(o))) return true;
        if ((m_second != null) && (m_second.equals(o))) return true;
        if (o != null) return false;
        return ((m_first == null) || (m_second == null));
    }
public boolean contains ( Object o ) { if ( ( m_first != null ) && ( m_first . equals ( o ) ) ) return true ; if ( ( m_second != null ) && ( m_second . equals ( o ) ) ) return true ; if ( o != null ) return false ; return ( ( m_first == null ) || ( m_second == null ) ) ; }
@param o Object to compare to.
@return Is the object equal to a value in the pair.