private void grow(){
  m_allocatedSize*=2;
  boolean newVector[]=new boolean[m_allocatedSize];
  System.arraycopy(m_values,0,newVector,0,m_index + 1);
  m_values=newVector;
}

private void grow ( ) { m_allocatedSize *= 2 ; boolean newVector [ ] = new boolean [ m_allocatedSize ] ; System . arraycopy ( m_values , 0 , newVector , 0 , m_index + 1 ) ; m_values = newVector ; }
grows the size of the stack
