用*输出一个空心四边形

public class Kong{
    public static void main(String[] args){ 

 for(int i = 0; i < 10; i++)
        {
            for (int j = 0; j < 10; j++)
            {
                if(i == 0 || i == 10 -1)
                     System.out.print("*");
                else
                    if(j == 0 || j == 10 - 1)
                         System.out.print("*");
                    else
                        System.out.print(" ");
 
            }
            System.out.println();
        }
            
    }
}