Tatyana Yushyna's questions

我有以毫秒为单位的时间来完成某项任务，我想以小时：分钟：秒格式显示它

下面我给出2种方式，这是执行的结果：给定longTime = 18624，结果我们得到strTime1 = "03:00:18", strTime = "00:18"

第一种方法中的 3 小时从何而来？

public static String getStrTime(long longTime){
    // 1 способ
        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
        String strTime1 = df.format(longTime);

    // 2 способ
        long time = longTime/1000;
        String strTime;
        int ch = (int) time/(60*60);
        int min = (int) (time-ch*60*60)/60;
        int s = (int) time-ch*60*60 - min*60;

        if (ch>0) {
            strTime = "" + ((ch>9)?"":"0") + ch + ":" + ((min>9)?"":"0") + min + ":" + ((s>9)?"":"0") + s;
        } else {
            strTime = "" + ((min>9)?"":"0") + min + ":" + ((s>9)?"":"0") + s;
        }
        return strTime;
    }