Java Long Number Readable Format formatBytes(long bytes)

Description

Formats bytes in human readable form.

License

Apache License

Parameter

Parameter	Description
bytes	the number of bytes

Return

the formatted bytes

Declaration

public static String formatBytes(long bytes) 

Method Source Code

//package com.java2s;
// Licensed under the Apache License, Version 2.0 (the "License");

public class Main {
    /**//  w ww  .  ja v  a2 s .  c om
     * Formats bytes in human readable form.
     * 
     * @param bytes the number of bytes
     * @return the formatted bytes
     */
    public static String formatBytes(long bytes) {
        if (Long.MAX_VALUE == bytes) {
            return "\u221e B ";
        }

        String unit = "B ";
        double value = Math.abs(bytes);

        if (value > 1024) {
            value /= 1024;
            unit = "KB";
        }

        if (value > 1024) {
            value /= 1024;
            unit = "MB";
        }

        if (value > 1024) {
            value /= 1024;
            unit = "GB";
        }

        if (value > 1024) {
            value /= 1024;
            unit = "TB";
        }

        if (value > 1024) {
            value /= 1024;
            unit = "PB";
        }

        if (value > 1024) {
            value /= 1024;
            unit = "EB"; // the Enterprise might still use it. 
        }

        String result = String.format("%,.1f %s", value, unit);

        if (bytes < 0) {
            result = "-" + result;
        }

        return result;
    }
}

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