对一个数组进行螺旋式打印，java语言实现

public class CyclePrint
{
public static void main(String args[])
{
int[][]a=new int[][]{{1,2,3,4},{2,1,4,3},{3,4,1,2},{4,3,2,1}};
CyclePrint cyc=new CyclePrint();
cyc.printurn(a, 0, 4);
}
private void printurn(int[][]b,int x,int y)
{
for(int j=x;j<y;j++)
{
System.out.print(b[x][j]+" ");
}
System.out.println("---------------------");

for(int i=x;i<y;i++)
{
System.out.print(b[i][y-1]+" ");
}
System.out.println("---------------------");

for(int j=y-1;j>=x;j--)
{
System.out.print(b[y-1][j]+" ");
}
System.out.println("---------------------");

for(int j=y-1;j>=x;j--)
{
System.out.print(b[j][x]+" ");
}
System.out.println("---------------------");
x++;
y--;
if(x==y)
{
return;
}
this.printurn(b, x, y);
}
}