Java File readableFileSize() Utility Method

Java File readableFileSize() Utility Method - Get file size in human readable size using SI prefix - B,KB,MB,GB,TB.

Java File readableFileSize() Utility Method - Get file size in human readable size using SI prefix - B,KB,MB,GB,TB

/**
 * Given the size of a file outputs as human readable size using SI prefix.
 * <i>Base 1024</i>
 * @param size Size in bytes of a given File.
 * @return SI String representing the file size (B,KB,MB,GB,TB).
 */
public static String readableFileSize(long size) {
    if (size <= 0) {
        return "0";
    }
    final String[] units = new String[] {
        "B",
        "KB",
        "MB",
        "GB",
        "TB"
    };
    int digitGroups = (int)(Math.log10(size) / Math.log10(1024));
    return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) +
        " " + units[digitGroups];
}