java - 添加迄今为止的数字(H :mm:ss:SSS) format

Question

我想添加日期格式(H:mm:ss:SSS)。我做了以下操作-

    Date time1;
    Date time2;
    String result1;
    SimpleDateFormat formatter;
    formatter = new SimpleDateFormat("H:mm:ss:SSS");
    time1 = new Date(0,0,0,0,0,5);
    time2=new Date(0,0,0,0,0,5);

time1 的输出是0:00:05:000。现在我想添加这两次并生成 0:00:10:000。但 time1+time2 是不可能的。有什么办法可以做到这一点吗？

Answer 1

您可以使用日历来满足您的要求:

    Calendar calendar = Calendar.getInstance();
    calendar.setTime(new Date());
    calendar.set(Calendar.HOUR_OF_DAY,0);
    calendar.set(Calendar.MINUTE,0);
    calendar.set(Calendar.SECOND,5);
    calendar.set(Calendar.MILLISECOND,0);

    System.out.println(formatter.format(calendar.getTime()));

    Calendar another = Calendar.getInstance();
    another.setTime(calendar.getTime());
    another.set(Calendar.HOUR_OF_DAY,0);
    another.set(Calendar.MINUTE,0);
    another.set(Calendar.SECOND,calendar.get(Calendar.SECOND)+5);
    another.set(Calendar.MILLISECOND,0);

    System.out.println(formatter.format(another.getTime()));

输出:

0:00:05:000
0:00:10:000

这是 Calendar 的 Java 文档