打印三角形

打印：

public class test{
    
    public static void main(String args[]){
        fun(9);
    }
    
    public static void fun(int n){
        for(int i=1; i<=n; i++){
            StringBuffer s = new StringBuffer("");
            StringBuffer o = new StringBuffer("");
            for(int j=1; j<=n-i; j++){
                s.append(" ");
            }
            for(int j=1; j<=2*i-1; j++){
                o.append("o");
            }
            System.out.print(s);
            System.out.print(o);
            System.out.println();
        }
    }
}