問題描述
我知道這里也有同樣的問題，但我試過了提供的答案，它返回了一個(gè)我不明白的輸出.我對答案感到困惑，我認(rèn)為輸出不正確.
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.
我需要幫助，謝謝:)
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);
這是輸出:
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]
我應(yīng)該提取輸出的哪個(gè)位置來檢索星期一的日期?
Where on the output should I extract to retrieve Monday's date?
推薦答案
Java 8+
LocalDate ld = LocalDate.of(2014, Month.JUNE, 12);
System.out.println(ld);
ld = ld.with(TemporalAdjusters.next(DayOfWeek.MONDAY));
System.out.println(ld);
哪些打印...
2014-06-12
2014-06-16
因?yàn)槲业膶?shí)際日期可能是星期一，所以您也可以使用...
Because it's possible that the date my actually be a Monday, you could also use...
ld = ld.with(TemporalAdjusters.nextOrSame(DayOfWeek.MONDAY));
Java <= 7
您應(yīng)該使用 ThreeTen Backport，它為您提供 Java 8 Date/的支持時(shí)間接口
Java <= 7
You should be using the ThreeTen Backport, which gives you the support of the Java 8 Date/Time API
代替 System.out.println(date1); 使用 System.out.println(date1.getTime());
getTime 返回一個(gè) Date 的實(shí)例，它表示 Calendar
getTime returns an instance of Date which represents the current state of the Calendar
這將輸出 Mon Jul 14 00:00:00 EST 2014
System.out.println(date1) 等價(jià)于使用 System.out.println(date1.toString())，在本例中為轉(zhuǎn)儲一堆關(guān)于 Calendar 對象狀態(tài)的有用信息，但不是真正的人類可讀數(shù)據(jù).
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()) 將使用 Date 的 to toString 方法來顯示日期值, 根據(jù)當(dāng)前的本地設(shè)置格式化，這將提供更多有用的信息.
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.
更新
不要使用GregorianCalendar，而應(yīng)該使用系統(tǒng)Calendar，例如...
Instead of using GregorianCalendar, you should use the system Calendar, for example...
Calendar date1 = Calendar.getInstance();
date1.set(2014, 06, 12);
此外，月份是 0 索引的，這意味著 Janurary 實(shí)際上是 0 而不是 1，因此在您的示例中，您指定了月份為 7 月，而不是 6 月.
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.
所以，相反，使用...
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());
哪個(gè)輸出了...
Mon Jun 16 16:22:26 EST 2014
從今天開始是下周一...或多或少 ;)
Which is next Monday from today...more or less ;)
這篇關(guān)于在特定日期之后的下周一獲得第一個(gè)?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！