如何把毫秒转换成小时和天？

Question

我想获取JVM的启动时间和正常运行时间。到目前为止，我已经做到了：

public long getjvmstarttime(){
    final long uptime = ManagementFactory.getRuntimeMXBean().getStartTime();
    return uptime;
}

public long getjvmuptime(){
    final long uptime = ManagementFactory.getRuntimeMXBean().getUptime();
    return uptime;
}

但是我得到的时间以毫秒为单位。如何将时间转换为天数和小时数。我想以这种格式显示毫秒：3天8小时32分钟。是否有可以转换毫秒数的amy内部Java方法？

Answer 1

下面的代码执行所需的数学运算并生成结果字符串：

private static final int SECOND = 1000;
private static final int MINUTE = 60 * SECOND;
private static final int HOUR = 60 * MINUTE;
private static final int DAY = 24 * HOUR;

// TODO: this is the value in ms
long ms = 10304004543l;
StringBuffer text = new StringBuffer("");
if (ms > DAY) {
  text.append(ms / DAY).append(" days ");
  ms %= DAY;
}
if (ms > HOUR) {
  text.append(ms / HOUR).append(" hours ");
  ms %= HOUR;
}
if (ms > MINUTE) {
  text.append(ms / MINUTE).append(" minutes ");
  ms %= MINUTE;
}
if (ms > SECOND) {
  text.append(ms / SECOND).append(" seconds ");
  ms %= SECOND;
}
text.append(ms + " ms");
System.out.println(text.toString());