输入某年某月某日，判断这一天是这一年的第几天？

吾独矣

于 2021-08-01 22:37:23 发布

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分类专栏： Java 文章标签： java

本文链接：https://blog.youkuaiyun.com/m0_56210400/article/details/119304959

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源代码：

public static void main(String[] args) {
		// TODO 自动生成的方法存根
		days();
	}
	public static void days() {
		Scanner in = new Scanner(System.in);
		System.out.println("请输入年");
		int year = in.nextInt();
		System.out.println("请输入月");
		int month = in.nextInt();
		System.out.println("请输入日");
		int day = in.nextInt();
		switch (month-1) {
		case 11:
			day+=30;
		case 10:
			day+=31;
		case 9:
			day+=30;
		case 8:
			day+=31;
		case 7:
			day+=31;
		case 6:
			day+=30;
		case 5:
			day+=31;
		case 4:
			day+=30;
		case 3:
			day+=31;
		case (2):
			if(year%4==0) {
				if(year%100==0) {
					if(year%400==0) 
							day+=29;
						else
							day+=28;
					}else 
						day+=29;
				}else 
					day+=28;
		case 1:
			day+=31;
		case 0:
			day=day;
			System.out.print("这是"+year+"年的第"+day+"天");
			break;
		default:
			System.out.println("请输入正确的年月日");
			break;
		}
	}