Java实现杨辉三角

public class YanghuiTriangleExample {
 2     
 3     public static void main(String[] args) {
 4         int rows = 10;
 5 
 6         for(int i =0;i<rows;i++) {
 7             int number = 1;
 8             //打印空格字符串
 9             System.out.format("%"+(rows-i)*2+"s","");
10             for(int j=0;j<=i;j++) {
11                  System.out.format("%4d",number);
12                  number = number * (i - j) / (j + 1);                
13             }
14             System.out.println();
15         }
16     }
17 }