How Can I Format Durations in Java as H:MM:SS?

Formatting Durations in Java: A Practical Approach to Achieve H:MM:SS

When working with durations, whether in seconds or other units, it's often desirable to display the time elapsed in a user-friendly format like H:MM:SS. However, standard Java utilities are typically designed for formatting dates and times, not durations explicitly.

Solution:

Overriding this limitation in Java requires a customized approach. Here's a simple and effective solution using the Formatter class:

String formatDuration(int seconds) {
  return String.format("%d:%02d:%02d",
                       seconds / 3600,
                       (seconds % 3600) / 60,
                       seconds % 60);
}

This short method takes an integer representing the duration in seconds and returns a formatted string following the H:MM:SS pattern.

Implementation:

1. Divide the seconds by 3600 to get hours.
2. Calculate minutes by dividing the remaining seconds (modulo 3600) by 60.
3. Find the remaining seconds by taking seconds modulo 60.
4. Use the String.format method to assemble the final string in the desired format.

Example:

To format a duration of 36061 seconds:

System.out.println(formatDuration(36061));
// Output: 10:01:01

This method provides a concise and efficient way to format durations in Java applications, enabling developers to display elapsed time in a human-readable format.

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