Java杨辉三角形

package com.itheima.d1_file;


public class DiGui2 {
    public static void main(String[] args) {

        for (int i = 1;i<=10;i++){
            for (int k = i;k<10;k++){
                System.out.print("t");
            }
            for (int j = 1;j<=i;j++){
                System.out.print(f(j,i) + "tt");
            }
            System.out.println();
        }
    }
    public static int f(int y,int x){
        if(y==1 || y == x){
            return 1;
        } else {
            return f(y-1,x-1) + f(y,x-1);
        }
    }
}