有没有一个很好的方式来获得星期三的日期？ [英] Is there a good way to get the date of the coming Wednesday?

问题描述

有没有一个很好的方式来获得星期三的日期？
也就是说，如果今天是星期二，我想在本周获得星期三的日期;如果今天是星期三，我想得到下个星期三的日期;如果今天是星期四，我想在下一周获得星期三的日期。

谢谢。

解决方案

基本算法如下：

• 获取当前日期


• 获取星期几


• 查找与星期三的差异


• 如果差异不正，则添加7（即坚持下一步未来/未来日期）


• 添加差异

以下是一段代码片段，这与 java.util.Calendar ：

  import java.util。日历; 
 
 public class NextWednesday {
 public static Calendar nextDayOfWeek（int dow）{
日历日期= Calendar.getInstance（）; 
 int diff = dow  -  date.get（Calendar.DAY_OF_WEEK）; 
 if（！（diff> 0））{
 diff + = 7; 
} 
 date.add（Calendar.DAY_OF_MONTH，diff）; 
返回日期; 
} 
 public static void main（String [] args）{
 System.out.printf（
％ta，％ nextDayOfWeek（Calendar.WEDNESDAY）
）; 
} 
} 
  

相对于我这里和现在，

API链接

• java.util.Calendar


• java.util.Formatter - 对于格式化字符串语法

Is there a good way to get the date of the coming Wednesday? That is, if today is Tuesday, I want to get the date of Wednesday in this week; if today is Wednesday, I want to get the date of next Wednesday; if today is Thursday, I want to get the date of Wednesday in the following week.

Thanks.

解决方案

The basic algorithm is the following:

• Get the current date
• Get its day of week
• Find its difference with Wednesday
• If the difference is not positive, add 7 (i.e. insist on next coming/future date)
• Add the difference

Here's a snippet to show how to do this with java.util.Calendar:

import java.util.Calendar;

public class NextWednesday {
    public static Calendar nextDayOfWeek(int dow) {
        Calendar date = Calendar.getInstance();
        int diff = dow - date.get(Calendar.DAY_OF_WEEK);
        if (!(diff > 0)) {
            diff += 7;
        }
        date.add(Calendar.DAY_OF_MONTH, diff);
        return date;
    }
    public static void main(String[] args) {
        System.out.printf(
            "%ta, %<tb %<te, %<tY",
            nextDayOfWeek(Calendar.WEDNESDAY)
        );
    }
}

Relative to my here and now, the output of the above snippet is "Wed, Aug 18, 2010".

API links

• java.util.Calendar
• java.util.Formatter - for the formatting string syntax

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