Question

所以这是一个旧代码，应该检查收到的传真但由于某种原因我找不到错误。

 Calendar receivedAfter = Calendar.getInstance();
 receivedAfter.add(Calendar.DAY_OF_YEAR, -14);

 System.out.println();
 System.out.println("Checking for received faxes since : " + receivedAfter);

我的输出是

检查收到的传真：

java.util.GregorianCalendar[time=1386017803339,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="America/New_York",offset=-18000000,dstSavings=3600000,useDaylight=true,transitions=235,lastRule=java.util.SimpleTimeZone[id=America/New_York,offset=-18000000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=3,startMonth=2,startDay=8,startDayOfWeek=1,startTime=7200000,startTimeMode=0,endMode=3,endMonth=10,endDay=1,endDayOfWeek=1,endTime=7200000,endTimeMode=0]],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2013,MONTH=11,WEEK_OF_YEAR=49,WEEK_OF_MONTH=1,DAY_OF_MONTH=2,DAY_OF_YEAR=336,DAY_OF_WEEK=2,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=3,HOUR_OF_DAY=15,MINUTE=56,SECOND=43,MILLISECOND=339,ZONE_OFFSET=-18000000,DST_OFFSET=0]

为什么打印出所有这些数据？有什么建议吗？

Answer 1

这是toString()内GregorianCalendar方法的默认实现。

快速替代方案，不做大量的日期格式化，将是：

 System.out.println("Checking for received faxes since : " + receivedAfter.getTime());

这为您提供了一个java.util.Date对象，该对象具有更人性化的toString()方法。

Answer 2

这是整个对象。您可能想要从对象中获取特定字段。试试

 System.out.println("Checking for received faxes since : " + receivedAFter.YEAR() + '/' +  receivedAfter.MONTH() + '/' + receivedAfter.DAY_OF_MONTH());

在特定日期之后检查收到的传真

2 个答案: