获取人类可读的时间（以纳秒为单位）

问题描述

我正在尝试使用 System.nanoTime（）

startTime = System.nanoTime()
Long elapsedTime = System.nanoTime() - startTime;
Long allTimeForDownloading = (elapsedTime * allBytes / downloadedBytes);

Long remainingTime = allTimeForDownloading - elapsedTime;

但是我无法弄清楚如何获得人类可以理解的纳秒级形式。例如： 1d 1h ， 36s 和 3m 50s 。

But I cannot figure how to get a human readable form of the nanoseconds; for example: 1d 1h, 36s and 3m 50s.

我该怎么办？

推荐答案

如果 remainingTime 以 nanoseconds 为单位，只需进行数学运算并将值附加到 StringBuilder ：

If remainingTime is in nanoseconds, just do the math and append the values to a StringBuilder:

long remainingTime = 5023023402000L;
StringBuilder sb = new StringBuilder();
long seconds = remainingTime / 1000000000;
long days = seconds / (3600 * 24);
append(sb, days, "d");
seconds -= (days * 3600 * 24);
long hours = seconds / 3600;
append(sb, hours, "h");
seconds -= (hours * 3600);
long minutes = seconds / 60;
append(sb, minutes, "m");
seconds -= (minutes * 60);
append(sb, seconds, "s");
long nanos = remainingTime % 1000000000;
append(sb, nanos, "ns");

System.out.println(sb.toString());

// auxiliary method
public void append(StringBuilder sb, long value, String text) {
    if (value > 0) {
        if (sb.length() > 0) {
            sb.append(" ");
        }
        sb.append(value).append(text);
    }
}

上面的输出是：

（1小时23分钟，43秒和23402000纳秒）。

(1 hour, 23 minutes, 43 seconds and 23402000 nanoseconds).

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