java比较时间及时间的转换

时间日期转换工具类：SimpleDateFormat

比较时间工具类：Calendar

直接上代码：

    @Test
    public void test() throws ParseException {
        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
        Date time = df.parse("22:00:00");
        Date begin = df.parse("7:00:00");
        Date end = df.parse("22:00:00");
        Calendar nowTime = Calendar.getInstance();
        nowTime.setTime(time);
        Calendar beginTime = Calendar.getInstance();
        beginTime.setTime(begin);
        Calendar endTime = Calendar.getInstance();
        endTime.setTime(end);
//        System.out.println("endTime:" + endTime);
        if ((nowTime.before(endTime) && nowTime.after(beginTime)) || nowTime.equals(endTime) || nowTime.equals(beginTime)) {
            System.out.println("在该时间段内");
        } else {
            System.out.println("不在");
        }
    }