题目：输出9*9口诀。
1、9行9列的乘法口诀：
package cn.ls.lanqiao;public class Test16 {public static void main(String[] args) {int i = 0;int j = 0;for (i = 1; i <= 9; i++) {for (j = 1; j <= 9; j++)System.out.print(i + "*" + j + "=" + i * j + "\t");System.out.println();}}
}
2、不出现重复的乘积(下三角)：
package cn.ls.lanqiao;public class Test16 {public static void main(String[] args) {int i = 0;int j = 0;for (i = 1; i <= 9; i++) {for (j = 1; j <= i; j++)System.out.print(i + "*" + j + "=" + i * j + "\t");System.out.println();}}
}
3、上三角：
package cn.ls.lanqiao;public class Test16 {public static void main(String[] args) {int i = 0;int j = 0;for (i = 1; i <= 9; i++) {for (j = i; j <= 9; j++)System.out.print(i + "*" + j + "=" + i * j + "\t");System.out.println();}}
}