【JAVA】java循环语句*案例三：用java实现输入某年某月某日，判断这一天是这一年的第几天？

女爷i 2022-05-22 08:45 258阅读 0赞

package com.test;  
  
  
import java.util.Scanner;  
  
  
/\*\*  
\* 案例3：用java实现输入某年某月某日，判断这一天是这一年的第几天？  
\*/  
public class ForLoopDemo3 \{  
  
  
@SuppressWarnings("resource")  
public static void main(String\[\] args) \{  
int year;  
int mouth;  
int day = 0;  
int days;  
int d = 0; // 累计天数  
int e = 0;  
Scanner scanner = new Scanner(System.in);  
  
//判断输入的年份和月份和日期是否错误  
do \{  
System.out.println("输入年:");  
year = scanner.nextInt();  
System.out.println("输入月:");  
mouth = scanner.nextInt();  
System.out.println("输入日:");  
days = scanner.nextInt();  
if (year < 0 || mouth < 0 || mouth > 12 || days < 0 || days > 31) \{  
System.out.println("input error!");  
e = 1;  
\}  
\} while (e == 1);  
  
for (int i = 1; i < mouth; i++) \{  
switch (i) \{  
case 1:  
case 3:  
case 5:  
case 7:  
case 8:  
case 10:  
case 12: \{  
day = 31;  
break;  
\}  
case 4:  
case 6:  
case 9:  
case 11: \{  
day = 30;  
break;  
\}  
case 2: \{  
/\*\*  
 \* 闰年:①：非整百年数除以4，无余为闰，有余为平；②整百年数除以400，无余为闰有余平 二月：平年28天、闰年29天  
 \*/  
if ((year % 100 != 0 && year % 4 == 0) || (year % 100 == 0 && year % 400 == 0)) \{  
day = 29;  
\} else \{  
day = 28;  
\}  
\}  
default:  
break;  
\}  
d += day;  
\}  
System.out.println("这是" + year + "年的" + (d + days) + "天");  
\}

效果截图：

![70][]

[70]: /images/20220522/4960bbbacf124c729863c5b99a7d1944.png