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=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);
	}
}