[問題] 怎麼計算時間花費多少?
long FocusTimeInMillis = System.currentTimeMillis();
SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss");
Date d = new Date(System.currentTimeMillis() - FocusTimeInMillis);
String a = sdf.format(d);
為啥麼結果a都會是"08:00:00" 而不是"00:00:00"?
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