我正在编写一个需要处理日期的程序。我收到一个输入日期,它是一周的开始日期(星期一)。在这种情况下,时间为CET 2015年1月5日星期一。
然后,我需要定义一周中其他日期的日期。

我试图这样做:

Calendar cStart = Calendar.getInstance();

     Calendar cMon = Calendar.getInstance();
                Calendar cTue = Calendar.getInstance();
                Calendar cWed = Calendar.getInstance();
                Calendar cThu = Calendar.getInstance();
                Calendar cFri = Calendar.getInstance();
                Calendar cSat = Calendar.getInstance();
                Calendar cSun = Calendar.getInstance();

                cMon = cStart;
                cStart.add(Calendar.DAY_OF_MONTH, 1);
                cTue = cStart;
                cStart.add(Calendar.DAY_OF_MONTH, 1);
                cWed = cStart;
                cStart.add(Calendar.DAY_OF_MONTH, 1);
                cThu = cStart;
                cStart.add(Calendar.DAY_OF_MONTH, 1);
                cFri = cStart;
                cStart.add(Calendar.DAY_OF_MONTH, 1);
                cSat = cStart;
                cStart.add(Calendar.DAY_OF_MONTH, 1);
                cSun = cStart;

                System.out.println(cMon.getTime());
                System.out.println(cTue.getTime());
                System.out.println(cWed.getTime());
                System.out.println(cThu.getTime());
                System.out.println(cFri.getTime());
                System.out.println(cSat.getTime());
                System.out.println(cSun.getTime());


现在我的问题是,输出应如下所示:

Mon Jan 05 00:00:00 CET 2015
Tue Jan 06 00:00:00 CET 2015
Wed Jan 07 00:00:00 CET 2015
Thu Jan 08 00:00:00 CET 2015
Fri Jan 09 00:00:00 CET 2015
Sat Jan 10 00:00:00 CET 2015
Sun Jan 11 00:00:00 CET 2015


但实际上看起来像这样:

Sun Jan 11 00:00:00 CET 2015
Sun Jan 11 00:00:00 CET 2015
Sun Jan 11 00:00:00 CET 2015
Sun Jan 11 00:00:00 CET 2015
Sun Jan 11 00:00:00 CET 2015
Sun Jan 11 00:00:00 CET 2015
Sun Jan 11 00:00:00 CET 2015


我该怎么办才能收到所需的输出?

最佳答案

您正在为每个变量分配cStart的引用。使用clone()方法,每次都可以获取一个新对象。

Calendar cStart = Calendar.getInstance();

Calendar cMon = null;
Calendar cTue = null;
Calendar cWed = null;
Calendar cThu = null;
Calendar cFri = null;
Calendar cSat = null;
Calendar cSun = null;

cMon = (Calendar) cStart.clone();
cStart.add(Calendar.DAY_OF_MONTH, 1);
cTue = (Calendar) cStart.clone();
cStart.add(Calendar.DAY_OF_MONTH, 1);
cWed = (Calendar) cStart.clone();
cStart.add(Calendar.DAY_OF_MONTH, 1);
cThu = (Calendar) cStart.clone();
cStart.add(Calendar.DAY_OF_MONTH, 1);
cFri = (Calendar) cStart.clone();
cStart.add(Calendar.DAY_OF_MONTH, 1);
cSat = (Calendar) cStart.clone();
cStart.add(Calendar.DAY_OF_MONTH, 1);
cSun = (Calendar) cStart.clone();

System.out.println(cMon.getTime());
System.out.println(cTue.getTime());
System.out.println(cWed.getTime());
System.out.println(cThu.getTime());
System.out.println(cFri.getTime());
System.out.println(cSat.getTime());
System.out.println(cSun.getTime());


输出量

Mon Feb 22 12:45:39 CET 2016
Tue Feb 23 12:45:39 CET 2016
Wed Feb 24 12:45:39 CET 2016
Thu Feb 25 12:45:39 CET 2016
Fri Feb 26 12:45:39 CET 2016
Sat Feb 27 12:45:39 CET 2016
Sun Feb 28 12:45:39 CET 2016

10-07 19:36
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