9.28机试 使用二重循环打印图形

public class Demo6 {public static void main(String[] args) {int h = 4;for(int i=1;i<=h;i++){for(int j=0;j<=h-1;j++){}for(int k=1;k<=2*i-1;k++){System.out.print("*");}System.out.println();}for(int i=h-1;i>=1;i--){for(int j=1;j<=h-i;j++){}for(int k=1;k<=2*i-1;k++){System.out.print("*");}System.out.print("\n");}}}