java - 如何将 Java 中存储在 long 中的经过的毫秒数转换为格式为 mm :ss. ss 的字符串？

Question

我有一个按以下方式计算的变量 currTime:

long currTime = System.currentTimeMillis() - start; //where start is the start time of whatever I'm timing

如何将其转换为字符串以进行显示，例如:

12544 将显示为“00:12.54”

67855 将显示为“01:07.86”

...等等等等...？

Answer 1

我认为最简单的是手动完成:

public String elapsedToString(long elapsedTimeMillis) {
    long seconds = (elapsedTimeMillis + 500) / 1000; // round
    long minutes = seconds / 60;
    long hours = minutes / 60;
    return String.format("%1$02d:%2$02d:%3$02d",
        hours,
        minutes % 60,
        seconds % 60);
}

哎呀。你想要 mm:ss.ss

public String elapsedToString(long elapsedTimeMillis) {
    long hundredths = (elapsedTimeMillis + 5) / 10; // round
    long seconds = hundredths / 100;
    long minutes = seconds / 60;
    return String.format("%1$02d:%2$02d.%3$02d",
        minutes,
        seconds % 60,
        hundredths % 100);
}