public int push ( int i ) { if ( ( m_firstFree + 1 ) >= m_mapSize ) { m_mapSize += m_blocksize ; int newMap [ ] = new int [ m_mapSize ] ; System . arraycopy ( m_map , 0 , newMap , 0 , m_firstFree + 1 ) ; m_map = newMap ; } m_map [ m_firstFree ] = i ; m_firstFree ++ ; return i ; }
Pushes an item onto the top of this stack .