【需求说明】:写一段代码实现打印最简九九乘法表
【需求分析】:九九乘法表九行九列
【需求实现】：
1 /** 2 * 3 */ 4 package edu.aeon.algorithm; 5 6 /** 7 * @author by lzj 8 * 创建于: 2017年10月18日 上午11:20:18 9 * 需求/说明:打印出九九乘法表 10 */ 11 public class MultiplicationTable { 12 /** 13 * 第一种方法：使用两个for循环 使用if控制输出格式 14 * at 2017年10月18日 上午11:38:16 by lzj 15 * @parameters1 无 16 * @return void 17 */ 18 private static void cfb1() { 19 System.out.println("=========cfb1()=========="); 20 for(int i=1;i<=9;i++) { 21 for(int j=1;j<=i;j++) { 22 if(i*j<10) { 23 System.out.print(j+" x "+i+" = "+i*j+" "); 24 }else { 25 System.out.print(j+" x "+i+" = "+i*j+" "); 26 } 27 } 28 System.out.println(); 29 } 30 } 31 /** 32 * 33 * at 2017年10月18日 下午2:33:11 by lzj 34 * @parameters1 无 35 * @return void 36 */ 37 private static void cfb2() { 38 System.out.println("=========cfb2()=========="); 39 for(int i=1,j=1;j<=9;i++) { 40 if(i*j<10) { 41 System.out.print(j+" x "+i+" = "+i*j+" "); 42 }else { 43 System.out.print(j+" x "+i+" = "+i*j+" "); 44 } 45 if(i==j) { 46 i = 0; 47 j++; 48 System.out.println(); 49 50 } 51 } 52 } 53 /** 54 * at 2017年10月18日 上午11:20:18 by lzj 55 * @parameters1 无 56 * @parameters2 无 57 * @return void 58 */ 59 public static void main(String[] args) { 60 long a=System.currentTimeMillis(); 61 //这里放需要测试执行时间的代码段 62 cfb1(); 63 long b=System.currentTimeMillis(); 64 cfb2(); 65 System.out.println("执行cfb1()耗时 ："+(b-a)/1000f+"秒"); 66 System.out.println("执行cfb2()耗时 ："+(System.currentTimeMillis()-b)/1000f+"秒"); 67 } 68 69 } 70 ================【控制台输出】====================== 71 =========cfb1()========== 72 1 x 1 = 1 73 1 x 2 = 2 2 x 2 = 4 74 1 x 3 = 3 2 x 3 = 6 3 x 3 = 9 75 1 x 4 = 4 2 x 4 = 8 3 x 4 = 12 4 x 4 = 16 76 1 x 5 = 5 2 x 5 = 10 3 x 5 = 15 4 x 5 = 20 5 x 5 = 25 77 1 x 6 = 6 2 x 6 = 12 3 x 6 = 18 4 x 6 = 24 5 x 6 = 30 6 x 6 = 36 78 1 x 7 = 7 2 x 7 = 14 3 x 7 = 21 4 x 7 = 28 5 x 7 = 35 6 x 7 = 42 7 x 7 = 49 79 1 x 8 = 8 2 x 8 = 16 3 x 8 = 24 4 x 8 = 32 5 x 8 = 40 6 x 8 = 48 7 x 8 = 56 8 x 8 = 64 80 1 x 9 = 9 2 x 9 = 18 3 x 9 = 27 4 x 9 = 36 5 x 9 = 45 6 x 9 = 54 7 x 9 = 63 8 x 9 = 72 9 x 9 = 81 81 =========cfb2()========== 82 1 x 1 = 1 83 2 x 1 = 2 2 x 2 = 4 84 3 x 1 = 3 3 x 2 = 6 3 x 3 = 9 85 4 x 1 = 4 4 x 2 = 8 4 x 3 = 12 4 x 4 = 16 86 5 x 1 = 5 5 x 2 = 10 5 x 3 = 15 5 x 4 = 20 5 x 5 = 25 87 6 x 1 = 6 6 x 2 = 12 6 x 3 = 18 6 x 4 = 24 6 x 5 = 30 6 x 6 = 36 88 7 x 1 = 7 7 x 2 = 14 7 x 3 = 21 7 x 4 = 28 7 x 5 = 35 7 x 6 = 42 7 x 7 = 49 89 8 x 1 = 8 8 x 2 = 16 8 x 3 = 24 8 x 4 = 32 8 x 5 = 40 8 x 6 = 48 8 x 7 = 56 8 x 8 = 64 90 9 x 1 = 9 9 x 2 = 18 9 x 3 = 27 9 x 4 = 36 9 x 5 = 45 9 x 6 = 54 9 x 7 = 63 9 x 8 = 72 9 x 9 = 81 91 执行cfb1()耗时 ：0.002秒 92 执行cfb2()耗时 ：0.003秒
【需求实现运行结果】：
