java编程输出星号

*.*.
*..*..*.. 
*...*...*...*...
*....*....*....*....*.... 
*.....*.....*.....*.....*.....*.....
*......*......*......*......*......*......*......
*.......*.......*.......*.......*.......*.......*.......*..

public class PrintStar {
    public static void main(String[] args) {
     // TODO, add your application code
     for(int row=0;row<7;row++){  //输出数字
      for(int star=0;star<=row+1;star++){
       System.out.print("*"); 
        for(int space=0;space<=row;space++){ //输出空格
         System.out.print(".");
        }
      }
      System.out.println();
     }
    }
}