Java 输出蛇形矩阵

package Exercises;


import java.util.Scanner;


public class snake {


public static void main(String[] args) {
// TODO Auto-generated method stub
/**2、计算并输出nXn的蛇形矩阵。(n>0)
* 例如4X4的蛇形矩阵如下：
1 2 3 4 5
16 17 18 19 6
15 24 20 7
14 23 22 21 8
13 12 11 10 9
*/
System.out.print("Enter n:");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int a[][] = new int[n][n];
int round; //蛇形圈数为n/2；
int x,y;
int count=1;
if(n == 1){
a[0][0] = count;
}else{

for(round=0;round<n/2;round++)
{
x=round;
for(y=round;y<n-round;y++)
{
a[x][y]=count;
count++;
}
y=n-round-1;
for(x=round+1;x<n-round-1;x++)
{
a[x][y]=count;
count++;
}
x=n-round-1;
for(y=n-round-1;y>=round;y--)
{
a[x][y]=count;
count++;
}
y=round;
for(x=n-round-1-1;x>round;x--)
{
a[x][y]=count;
count++;
}
}
if(n%2==1)a[n/2][n/2]=count;
for(x=0;x<n;x++)
{
for(y=0;y<n;y++)
{
System.out.print(a[x][y]+" ");
}
System.out.print("\n");
}
}
}
}