Last Updated: September 12, 2021
·
324
· Bruno Volpato

Formatting byte size to human readable format in Java

// From https://programming.guide/java/formatting-byte-size-to-human-readable-format.html

public static String humanReadableByteCountBin(long bytes) {

    long absB = bytes == Long.MIN_VALUE ? Long.MAX_VALUE : Math.abs(bytes);

    if (absB < 1024) {
        return bytes + " B";
    }

    long value = absB;

    CharacterIterator ci = new StringCharacterIterator("KMGTPE");

    for (int i = 40; i >= 0 && absB > 0xfffccccccccccccL >> i; i -= 10) {
        value >>= 10;
        ci.next();
    }

    value *= Long.signum(bytes);

    return String.format("%.1f %ciB", value / 1024.0, ci.current());

}