How can I “pretty print” a Duration in Java?

by

I’ve built a simple solution, using Java 8’s Duration.toString() and a bit of regex:

public static String humanReadableFormat(Duration duration) {
    return duration.toString()
            .substring(2)
            .replaceAll("(\\d[HMS])(?!$)", "$1 ")
            .toLowerCase();
}

The result will look like:

- 5h
- 7h 15m
- 6h 50m 15s
- 2h 5s
- 0.1s

If you don’t want spaces between, just remove replaceAll.

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