打印蛇形排列的数（这算法挺牛的）

class?snakePrint?{??????static?int?length?=?7;??????static?int?value?=?1;??????static?int[][]?snake?=?new?int[length][length];??????static?Direction?lastDirection?=?Direction.Right;????????static?enum?Direction?{??????????Right,?Down,?Left,?Up;??????}????????public?static?void?initialArray()?{??????????int?row?=?0,?line?=?0;??????????for?(int?c?=?0;?c?<?length?*?length;?c++)?{??????????????snake[row][line]?=?value;??????????????lastDirection?=?findDirection(row,?line);??????????????switch?(lastDirection)?{??????????????????case?Right:??????????????????????line++;??????????????????????break;??????????????????case?Down:??????????????????????row++;??????????????????????break;??????????????????case?Left:??????????????????????line--;??????????????????????break;??????????????????case?Up:??????????????????????row--;??????????????????????break;??????????????????default:??????????????????????System.out.println("error");??????????????}??????????????value++;??????????}??????}????????static?Direction?findDirection(int?row,?int?line)?{??????????Direction?direction?=?lastDirection;??????????switch?(direction)?{??????????????case?Right:?{??????????????????if?((line?==?length?-?1)?||?(snake[row][line?+?1]?!=?0))??????????????????????direction?=?direction.Down;??????????????????break;??????????????}??????????????case?Down:?{??????????????????if?((row?==?length?-?1)?||?(snake[row?+?1][line]?!=?0))??????????????????????direction?=?direction.Left;??????????????????break;??????????????}??????????????case?Left:?{??????????????????if?((line?==?0)?||?(snake[row][line?-?1]?!=?0))??????????????????????direction?=?direction.Up;??????????????????break;??????????????}??????????????case?Up:?{??????????????????if?(snake[row?-?1][line]?!=?0)??????????????????????direction?=?direction.Right;??????????????????break;??????????????}??????????}??????????return?direction;??????}????????public?static?void?main(String[]?args)?{??????????initialArray();????????????//?display.....??????????for?(int?i?=?0;?i?<?length;?i++)?{??????????????for?(int?j?=?0;?j?<?length;?j++)?{??????????????????System.out.print(snake[i][j]?+?"??");??????????????}??????????????System.out.println();??????????}??????}??}?