Java基础面试题——(3)

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题目：从键盘分别输入年、月、日，判断这一天是当年的第几天。

代码实现：

public class JavaInterview_3 {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.println("输入year：");int year = scanner.nextInt();System.out.println("输入month：");int month = scanner.nextInt();System.out.println("输入day：");int day = scanner.nextInt();scanner.close();int sumDay = 0;switch (month) {case 12:sumDay += 30;case 11:sumDay += 31;case 10:sumDay += 30;case 9:sumDay += 31;case 8:sumDay += 31;case 7:sumDay += 30;case 6:sumDay += 31;case 5:sumDay += 30;case 4:sumDay += 31;case 3:if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)sumDay += 29;elsesumDay += 28;case 2:sumDay += 31;case 1:sumDay += day;}System.out.println(year + "年" + month + "月" + day + "日是今年的第" + sumDay+ "天");}}

运行效果：

PS：前提确保输入的日期是正确的。

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