用switch结构实现判断日期是这一年的第几天

野性酷女 2024-03-22 14:39 43阅读 0赞

## **1** **问题** ##

判断某年某月某日是这一年的第几天？

## **2** **方法** ##

使用switch选择结构实现判断某年某月某日是这一年的第几天？

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 <td>&nbsp; &nbsp;public static void main(String[] args) { &nbsp; &nbsp; &nbsp; &nbsp;Scanner sc = new Scanner(System.in); &nbsp; &nbsp; &nbsp; &nbsp;System.out.print("请输入年份："); &nbsp; &nbsp; &nbsp; &nbsp;int year = sc.nextInt(); &nbsp; &nbsp; &nbsp; &nbsp;System.out.print("请输入月份："); &nbsp; &nbsp; &nbsp; &nbsp;int month = sc.nextInt(); &nbsp; &nbsp; &nbsp; &nbsp;System.out.print("请输入天数："); &nbsp; &nbsp; &nbsp; &nbsp;int day = sc.nextInt(); &nbsp; &nbsp; &nbsp; &nbsp;switch (month) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 12: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 30; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 11: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 31; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 10: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 30; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 9: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 31; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 8: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 31; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 7: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 30; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 6: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 31; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 5: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 30; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 4: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 31; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 3: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (year % 4 == 0 &amp;&amp; year % 100 != 0 || year % 400 == 0) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 29; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} else { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 28; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 2: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;day += 31; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case 1: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;System.out.println(day); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;break; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;default: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;System.out.println("请输入正确的时间"); &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;break; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp; &nbsp; &nbsp; &nbsp;System.out.println("这是" + year + "年" + "第" + day + "天"); &nbsp; &nbsp;}</td> 
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## **3** **结语** ##

通过实现使用switch选择结构实现判断某年某月某日是这一年的第几天，可解决日常生活中的许多不少麻烦，在本次实验中受益良多，当然也有值得改进的地方，需要循循渐进，继续完善。