java - java中检查时间间隔

Question

我想要一些 Java 代码，它可以根据当前时间告诉我学校何时开放。

当我在上午 9 点到下午 6 点之间调用此方法时，它应该返回“学校开放”，否则它应该在下午 6 点之后和上午 9 点之前返回“学校关闭”。

public Calendar shopStartTime(String msg)
{
    Calendar currentTime = Calendar.getInstance();
    Calendar schoolTime = Calendar.getInstance();
    Calendar schoolClosedTime = Calendar.getInstance();
    schoolTime.set(Calendar.HOUR_OF_DAY, 9);
    schoolTime.set(Calendar.MINUTE, 0);
    schoolTime.set(Calendar.SECOND, 0);
    schoolTime.set(Calendar.MILLISECOND, 0);
    schoolClosedTime.set(Calendar.HOUR_OF_DAY, 18);
    schoolClosedTime.set(Calendar.MINUTE, 0);
    schoolClosedTime.set(Calendar.SECOND, 0);
    schoolClosedTime.set(Calendar.MILLISECOND, 0);
    if (schoolTime.compareTo(currentTime) <= 0 && 
       (currentTime.compareTo(schoolClosedTime)>=0))
    {
        // check for time
        Toast.makeText(getSherlockActivity(), "school is closed ", 
            Toast.LENGTH_SHORT).show();
    }
    else 
    {
        Toast.makeText(getSherlockActivity(), " school is open", 
            Toast.LENGTH_SHORT).show();
    }
    return currentTime;
}

但是代码不起作用，因为它总是返回相同的结果。如何测试其中一个时间是否位于一天中的其他两个时间之间？

Answer 1

阅读 javadoc!

if (currentTime.after(schoolTime) && currentTime.before(schoolClosedTime)) {
    // school is open
} else {
    // school is closed
}