human Readable Byte Count - Java java.lang

Java examples for java.lang:byte

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Description

human Readable Byte Count

Demo Code

/*/*from   www . j  a v  a 2  s  . co m*/
 * JCamStream, simple Java application for video surveillance from webcams.
 * Copyright (C) 2011 Papa Issa DIAKHATE (paissad).
 * 
 * This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        long bytes = 2;
        boolean si = true;
        System.out.println(humanReadableByteCount(bytes, si));
    }

    /**
     * @param bytes
     * @param si
     *            - If <code>true</code> then use 1000 unit, 1024 otherwise.
     * @return A String representation of the file size.
     * 
     */
    public static String humanReadableByteCount(final long bytes,
            final boolean si) {
        int unit = si ? 1000 : 1024;

        if (bytes < unit)
            return bytes + " B";

        int exp = (int) (Math.log(bytes) / Math.log(unit));
        String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + "";
        return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
    }
}

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