java 小时时间就近取整

/**
 * 时间就近取整
 * 08:00 -> 08:00,
 * 08:20 -> 08:30,
 * 08:30 -> 08:30,
 * 08:45 -> 09:00,
 * 23:56 -> 00:00
 *
 * @param time
 * @return outTime
 */
public static String getCompleteTime(String time) {
    String hour = "00";//小时
    String minutes = "00";//分钟
    String outTime = "00:00";
    StringTokenizer st = new StringTokenizer(time, ":");
    List<String> inTime = new ArrayList<String>();
    while (st.hasMoreElements()) {
        inTime.add(st.nextToken());
    }
    hour = inTime.get(0).toString();
    minutes = inTime.get(1).toString();
    if (Integer.parseInt(minutes) > 30) {
        hour = (Integer.parseInt(hour) + 1) + "";
        outTime = hour + ":00";
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
        try {
            outTime = sdf.format(sdf.parse(outTime));
        } catch (Exception e) {
            e.printStackTrace();
        }
    } else if (Integer.parseInt(minutes) == 00) {
        outTime = hour + ":00";
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
        try {
            outTime = sdf.format(sdf.parse(outTime));
        } catch (Exception e) {
            e.printStackTrace();
        }
    } else if (Integer.parseInt(minutes) <= 30 && Integer.parseInt(minutes) != 00) {
        outTime = hour + ":30";
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");

        try {
            outTime = sdf.format(sdf.parse(outTime));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return outTime;
}