如果你不知道最小/最大值的顺序

Date a, b;   // assume these are set to something
Date d;      // the date in question

return a.compareTo(d) * d.compareTo(b) > 0;

如果你希望范围包括在内

return a.compareTo(d) * d.compareTo(b) >= 0;

这可能更具可读性：

Date min, max;   // assume these are set to something
Date d;          // the date in question

return d.after(min) && d.before(max);