Question

我想创建一个程序，检查输入是否大于 8h30m 。我该如何做到这一点？我想可能是关于java.util.Calendar或Date，但我不知道这些事情是如何运作的。

Answer 1

尝试使用Joda Timer

http://www.joda.org/joda-time/

你可以使用DateTime，我们的功能就是你的情况。

Answer 2

使用Java 8中的Duration：

String input = "8h";
Duration duration = Duration.parse("PT" + input);
Duration compared = Duration.ofHours(8).plus(Duration.ofMinutes(30));
int compare = duration.compareTo(compared); // -1
// compare would be 0 for input="8h30m" and 1 for input="8h40m"

修改 - 您也可以减去时间，例如获取秒数：

Duration diff = duration.minus(compared);
int seconds = diff.getSeconds();

Answer 3

如果你想要的是检查当前时间是否在另一个时间之前，你可以这样做：

public Boolean foo() {
    Calendar currentlyCal = Calendar.getInstance(); // This is the currently time.
    Calendar calToCheck = Calendar.getInstance();
    calToCheck.set(Calendar.HOUR_OF_DAY, 8);
    calToCheck.set(Calendar.MINUTE, 30);
    return currentlyCal.before(calToCheck); // or use after() instead of before() if it's what you want.
}

修改

区别：

public void getDifference(Calendar cal1, Calendar cal2) {
    long diff = cal2.getTimeInMillis() - cal.getTimeInMillis();
    long seconds = diff/1000;
    long hour = seconds/3600;
    seconds = seconds%3600;
    long minutes = seconds/60;
    seconds = seconds%60;
    // .. do something
}

如何在计算中使用时间（半小时）

3 个答案: