（Java）输出一个边长为四的菱形

public class 用for循环打印菱形 {
public static void main(String[]args)
{
	int x,y,z;
	for(x=0;x<=3;x++)
	{
		for(y=0;y<=2-x;y++)
		System.out.print(" ");
		for(z=0;z<=2*x;z++)
			System.out.print("*");
		System.out.print("n");
	}
	for(x=0;x<=2;x++)
	{
		for(y=0;y<=x;y++)
			System.out.print(" ");
		for(z=0;z<=4-2*x;z++)
			System.out.print("*");
		System.out.print("n");

	}
		}
	}