1 package com.xl.struct;
 2 
 3 public class ForDemo04 {
 4     public static void main(String[] args) {
 5         //1.我们先打印第一列，这个大家应该都会
 6         //2.我们把固定的1再用一个循环包起来
 7         //3.去掉重复项， i<=j
 8         //4.调整样式
 9         for (int j = 1; j <= 9; j++) {
10             for (int i = 1; i <= j; i++) {
11                 System.out.print(j+"*"+i+"="+(j*i)+"\t");
12 
13             }
14             System.out.println();
15 
16         }
17 
18 
19     }
20 }

 1 package com.xl.exercise;
 2 
 3 public class WhileForDemo04 {
 4     public static void main(String[] args) {
 5         int i,j;
 6         j=1;
 7         while (j<=9){
 8             i=1;
 9             while (i<=j) {
10                 System.out.print(i + "*" + j + "=" + i * j + "\t");
11                 i++;
12             }
13             j++;
14             System.out.println("");
15         }
16     }
17 
18 }