万年历（包括显示系统时间）

最新推荐文章于 2022-06-14 19:01:08 发布

zheng192004

最新推荐文章于 2022-06-14 19:01:08 发布

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分类专栏： java 文章标签： exception string date input

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本文介绍了一个用Java实现的万年历程序，该程序能够根据用户输入的年份和月份显示对应月份的日历，并考虑了闰年的特殊情况。此外，程序还展示了如何获取当前系统时间。

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public static void main(String[] args) throws Exception { int year; int month; int day = 0; int sumA = 0; int sumB = 0; System.out .println("* * * * * * * * * * * * * * * * * *欢迎使用万年历* * * * * * * * * * * * * * * * * */n "); Scanner input = new Scanner(System.in); System.out.print("请输入年份:/n"); year = input.nextInt(); System.out.print("请输入月份:/n"); month = input.nextInt(); boolean count; count = (year % 4 == 0 && year % 100 != 0 || year % 400 == 0); for (int i = 1900; i < year; i++) { if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) { sumA = sumA + 366; } else { sumA = sumA + 365; } } for (int k = 1; k < month; k++) { if (k == 1 || k == 3 || k == 5 || k == 7 || k == 8 || k == 10 || k == 12) { sumB = sumB + 31; } else if (k == 2 && count) { sumB = sumB + 29; } else if (k == 2 && !count) { sumB = sumB + 28; } else if (k == 4 || k == 6 || k == 9 || k == 11) { sumB = sumB + 30; } } for (int k = 1; k < month; k++) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { day = 31; } else if (month == 2 && count) { day = 29; } else if (month == 2 && !count) { day = 28; } else if (month == 4 || month == 6 || month == 9 || month == 11) { day = 30; } } int sum = sumA + sumB; //System.out.println(sum); int weekDay = 1 + sum % 7; System.out.println("/t/t/t" + year + "年" + month + "月"); System.out.println("星期日/t星期一/t星期二/t星期三/t星期四/t星期五/t星期六/t"); if (weekDay == 7) { weekDay = 0; } for (int nullNo = 0; nullNo < weekDay; nullNo++) { System.out.print(" /t"); } for (int i = 1; i <= day; i++) { if ((sum + i) % 7 == 6) { System.out.print(i); System.out.println(); } else { System.out.print(i + "/t"); } } System.out.println("/n"); long begin = System.currentTimeMillis(); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date currentTime = new Date();//得到当前系统时间 String timeStr_1 = formatter.format(currentTime); //将日期时间格式化 long end = System.currentTimeMillis(); System.out.println(timeStr_1 + " cost:" + (end - begin) + "ms"); }