Java任务需要两个Date()值

Question

这是一个非常简单的请求,但我不太确定生成这两个值的最简单/最有效的方法.

我需要编写一个脚本来检查给定值是否在两个值之间.我很清楚这是如何在SQL中完成的.

我需要这些值的方式与以下类似.

Date testValue = new Date()       //This represents the value we are testing

Date beginningOfDay = ....        //This value would represent the date for 
                                    testValue  at 12:00am

Date endOfDay = ...               //This value would represent the date for 
                                   testValue at 11:59:59pm

同样,Java Date()类型可能不是执行此类操作的最佳实践.最后,我只需要生成三个可以说的值

if testValue is after beginningOfDay && testValue is before endOfDay 
     //do logic

Answer 1

Personally I use the Calendar object for this. For example:

Date testDate = ??? //Replace with whatever source you are using
Calendar testDateCalendar = Calendar.getInstance();
testDateCalendar.setTime(testDate);

Date today = new Date();
Calendar endOfDay = Calendar.getInstance();  //Initiates to current time
endOfDay.setTime(today);
endOfDay.set(Calendar.HOUR_OF_DAY, 23);
endOfDay.set(Calendar.MINUTE, 59);
endOfDay.set(Calendar.SECOND, 59);

Calendar startOfDay = Calendar.getInstance();
startOfDay.setTime(today);
startOfDay.set(Calendar.HOUR_OF_DAY, 0);
startOfDay.set(Calendar.MINUTE, 0);
startOfDay.set(Calendar.SECOND, 0);

if (startOfDay.before(testDateCalendar) && endOfDay.after(testDateCalendar))
{
//Whatever
} else {
//Failure
}