n*m的螺旋数组的java实现

import java.util.Scanner;
class hello
{
	public static void main(String args[]){
		System.out.print("请输入n和m:");
			Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
					Scanner sx=new Scanner(System.in);
		int m=sx.nextInt();
                 //  int n = 4;
                 //  int m = 5;
                   int[][] data = new int[n][m];
                   int dire;   //当前数字的移动方向
                   final int UP = 0;   //上
                   final int DOWN = 1; //下
                   final int LEFT = 2; //左
                   final int RIGHT = 3;//右
                   dire = RIGHT;
                   int value = 1;    //数组元素的值
                   int row = 0;     //第一维下标
                   int col = 0;     //第二维下标
                   data[0][0] = 1; //初始化第1个元素
                   while(value < n * m){
                            switch(dire){
                                     case UP:
                                               row--; //移动到上一行
                                               if(row < 0){ //超过边界
                                                        row++; //后退
                                                        dire = RIGHT;
                                                        continue; //跳过该次循环
                                               }else if(data[row][col] != 0){//已赋值
                                                        row++; //后退
                                                        dire = RIGHT;
                                                        continue; //跳过该次循环
                                               }
                                               break;
                                     case DOWN:
                                               row++; //移动到下一行
                                               if(row >= n){ //超过边界
                                                        row--; //后退
                                                        dire = LEFT;
                                                        continue; //跳过该次循环
                                               }else if(data[row][col] != 0){//已赋值
                                                        row--; //后退
                                                        dire = LEFT;
                                                        continue; //跳过该次循环
                                               }
                                               break;
                                     case LEFT:
                                               col--; //移动到前一列
                                               if(col < 0){ //超过边界
                                                        col++; //后退
                                                        dire = UP;
                                                        continue; //跳过该次循环
                                               }else if(data[row][col] != 0){//已赋值
                                                        col++; //后退
                                                        dire = UP;
                                                        continue; //跳过该次循环
                                               }
                                               break;
                                     case RIGHT:
                                               col++; //移动到后一行
                                               if(col >= m){ //超过边界
                                                        col--; //后退
                                                        dire = DOWN;
                                                        continue; //跳过该次循环
                                               }
											  else if(data[row][col] != 0){//已赋值
                                                        col--; //后退
                                                        dire = DOWN;
                                                        continue; //跳过该次循环
                                               }
                                               break;
                            }
                            value++; //数值增加1
                            data[row][col] = value;//赋值                    
                   }
                   //输出数组中的元素
                   for(int i = 0;i < data.length;i++){
                            for(int j = 0;j < data[i].length;j++){
                                     if(data[i][j] < 10){//右对齐
                                               System.out.print(' ');
                                     }
                                     System.out.print(data[i][j]);
                                     System.out.print(' ');
                            }
                            System.out.println();
                   }
	}
	}