Java:如何检查给定时间是否介于两次之间? [英] Java: How to check whether given time lies between two times?
问题描述
我想检查目标时间是否在两个给定时间之间,而不考虑使用Java8时间的日期。假设开始时间21:30,结束时间06:30,目标时间03:00 ,所以程序应该返回true。
I want to check whether target time lies between two given times without considering date using Java8 time. Let say if starting time is "21:30" , ending time is "06:30" and target time is "03:00", so program should return true.
@Test
public void posteNuit()
{
DateTimeFormatter format = DateTimeFormatter.ofPattern("HH:mm");
String s = "21:30";
String e = "06:30";
String t = "03:00";
LocalTime startTime = LocalTime.parse(s, format);
LocalTime endTime = LocalTime.parse(e, format);
LocalTime targetTime = LocalTime.parse(t, format);
if ( targetTime.isBefore(endTime) && targetTime.isAfter(startTime) ) {
System.out.println("Yes! night shift.");
} else {
System.out.println("Not! night shift.");
}
}
推荐答案
你使用了LocalTime,它不存储日期信息,只存储时间。
然后你试图检查目标时间是否在开始时间之后( 03:00
21:30之后
)。这个陈述是错误的。
You've used LocalTime which doesn't store date information, only time.
Then you are trying to check if target time is after start time (03:00
after 21:30
). This statement is false.
你的开始时间应该在结束时间之前。
Your start time should be before end time.
如果你需要处理夜晚转移试试以下:
If you need to handle night shift try following:
if (startTime.isAfter(endTime)) {
if (targetTime.isBefore(endTime) || targetTime.isAfter(startTime)) {
System.out.println("Yes! night shift.");
} else {
System.out.println("Not! night shift.");
}
} else {
if (targetTime.isBefore(endTime) && targetTime.isAfter(startTime)) {
System.out.println("Yes! without night shift.");
} else {
System.out.println("Not! without night shift.");
}
}
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