Java File Size Readable Format toHumanReadableFileSize(long fileSize)

Description

transforms the given file size in bytes into a human readable string like "15 MB" or "256 KB"

License

Open Source License

Parameter

Parameter	Description
fileSize	a parameter

Declaration

public static String toHumanReadableFileSize(long fileSize) 

Method Source Code

//package com.java2s;
/*/*from  w w w  . j a  v a2 s .c  om*/
 * Copyright (C) 2016 Florian Frankenberger.
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

public class Main {
    private static final String[] FILE_SIZE_NAMES = { "Bytes", "KB", "MB", "GB" };

    /**
     * transforms the given file size in bytes into a human readable
     * string like "15 MB" or "256 KB"
     *
     * @param fileSize
     * @return
     */
    public static String toHumanReadableFileSize(long fileSize) {
        for (int i = FILE_SIZE_NAMES.length - 1; i > 0; --i) {
            float thisValue = (float) Math.pow(1024, i);
            if (fileSize / thisValue > 1) {
                return String.format("%3.2f %s", fileSize / thisValue, FILE_SIZE_NAMES[i]);
            }
        }

        return "0";
    }
}

Related

1. getReadableFileSize(long fileSizeInBytes)
2. getReadableFileSize(long size)
3. getReadableFileSize(long size, boolean abbreviation)
4. toHuman(Double n)
5. toHumanReadableByteCount(final long bytes)
6. toHumanReadableSize(final long bytes)