在特定日期后下星期一获得第一？ [英] Get first next Monday after certain date?

问题描述

我知道这里有同样的问题，但我试过答案提供了，它返回一个我不明白的输出。我感到困惑的答案，我不认为输出是正确的。

我需要帮助，谢谢：）

  GregorianCalendar date1 = new GregorianCalendar（2014，05，12）; // 05是月6月开始从0 -11 
 
 while（date1.get（Calendar.DAY_OF_WEEK）！= Calendar.MONDAY）
 date1.add（Calendar.DATE，1） ; 
 
 System.out.println（date1）; 
  

这是输出：

  java.util.GregorianCalendar [time = 1405267200000，areFieldsSet = true，areAllFieldsSet = true，lenient = true，zone = sun.util.calendar.ZoneInfo [id =Asia / Singapore 28800000，dstSavings = 0，useDaylight = false，transitions = 9，lastRule = null]，firstDayOfWeek = 1，minimalDaysInFirstWeek = 1，ERA = 1，YEAR = 2014，MONTH = 6，WEEK_OF_YEAR = 29，WEEK_OF_MONTH = 3，DAY_OF_MONTH = 14 ，DAY_OF_YEAR = 195，DAY_OF_WEEK = 2，DAY_OF_WEEK_IN_MONTH = 2，AM_PM = 0，HOUR = 0，HOUR_OF_DAY = 0，MINUTE = 0，SECOND = 0，MILLISECOND = 0，ZONE_OFFSET = 28800000，DST_OFFSET = 0] 
  

我应该提取哪一个输出以检索星期一的日期？

解决方案

而不是 System.out.println（date1）; 使用 System.out.println（date1。 getTime（））;

getTime 返回 Date ，代表日历

的当前状态c $ c> Mon Jul 14 00:00:00 EST 2014

System.out.println（date1） 是使用 System.out.println（date1.toString（））的等价，在这种情况下，是倾销一堆有用的关于日历对象的状态的信息，但不是真正的人类可读数据。

System.out.println（date1.getTime（））将使用日期的 toString 方法显示日期值，根据当前的本地设置进行格式化，这将提供更多有用的信息。

更新 p>

不要使用 GregorianCalendar ，应使用系统 Calendar ，例如...

 日历date1 = Calendar.getInstance 
 date1.set（2014，06，12）; 
  

此外，月份 0 Janurary实际上是 0 不是 1 ，因此在您的示例中，您指定的月份为7月，

而是使用...

  = Calendar.getInstance（）; 
 date1.set（2014，05，12）; 
 
 while（date1.get（Calendar.DAY_OF_WEEK）！= Calendar.MONDAY）{
 date1.add（Calendar.DATE，1）; 
} 
 
 System.out.println（date1.getTime（））; 
  

哪个输出...

  Mon Jun 16 16:22:26 EST 2014 
  

星期一从今天...或多或少;）

I know there is the same question here, but I have tried the answer provided and it returned an output that I don't understand. I am confused by the answer and I don't think the output is correct.

I need help, thank you :)

GregorianCalendar date1 = new GregorianCalendar( 2014, 05, 12 ); //05 is june as month start from 0 -11

while( date1.get( Calendar.DAY_OF_WEEK ) != Calendar.MONDAY )
    date1.add( Calendar.DATE, 1 );  

System.out.println(date1);

Here is the output:

java.util.GregorianCalendar[time=1405267200000,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Singapore",offset=28800000,dstSavings=0,useDaylight=false,transitions=9,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2014,MONTH=6,WEEK_OF_YEAR=29,WEEK_OF_MONTH=3,DAY_OF_MONTH=14,DAY_OF_YEAR=195,DAY_OF_WEEK=2,DAY_OF_WEEK_IN_MONTH=2,AM_PM=0,HOUR=0,HOUR_OF_DAY=0,MINUTE=0,SECOND=0,MILLISECOND=0,ZONE_OFFSET=28800000,DST_OFFSET=0]

Where on the output should I extract to retrieve Monday's date?

解决方案

Instead of System.out.println(date1); use System.out.println(date1.getTime());

getTime returns an instance of Date which represents the current state of the Calendar

Which will output Mon Jul 14 00:00:00 EST 2014

System.out.println(date1) is the equivlent of using System.out.println(date1.toString()), which, in this case, is dumping a bunch of useful info about the state of the Calendar object, but not really human readable data.

System.out.println(date1.getTime()) will use the Date's to toString method to display a date value, formatted based on the current local settings, which will provide more useful information.

Updated

Instead of using GregorianCalendar, you should use the system Calendar, for example...

Calendar date1 = Calendar.getInstance();
date1.set(2014, 06, 12);

Also, months are 0 indexed, meaning that Janurary is actually 0 not 1, so in your example, you've specified the month as July, not June.

So, instead, using...

Calendar date1 = Calendar.getInstance();
date1.set(2014, 05, 12);

while (date1.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY) {
    date1.add(Calendar.DATE, 1);
}

System.out.println(date1.getTime());

Which outputted...

Mon Jun 16 16:22:26 EST 2014

Which is next Monday from today...more or less ;)

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