public class CommonUtil {    private static final int HOUR_SECOND = 60 * 60;    private static final int MINUTE_SECOND = 60;    public static String getTimeStrBySecond(long second) {        if (second <= 0) {            return "00:00:00";        }        StringBuilder sb = new StringBuilder();        long hours = second / HOUR_SECOND;        if (hours > 0) {            second -= hours * HOUR_SECOND;        }        long minutes = second / MINUTE_SECOND;        if (minutes > 0) {            second -= minutes * MINUTE_SECOND;        }        return (hours >= 10 ? (hours + "")                : ("0" + hours) + ":" + (minutes >= 10 ? (minutes + "") : ("0" + minutes)) + ":"                + (second >= 10 ? (second + "") : ("0" + second)));    }}