Please convert these from python to java (java is so hard) need to be in the same file Thank you very much for your help !

def neighborhood(cells, row, col): if not is_valid(cells, row, col): raise ValueError() nhood = [[False, False, False], [False, False, False], [False, False, False]] left = col - 1 top = row 1 for r in range (0,3): cellsRow = top + r for c in range (0,3): cellsCol = left + c if is_valid(cells, cellsRow, cel1sCol): return nhood def num_alive (cells): n_alive = 0 for row in cells: for elem in row: if (elem): return n_alive