Java tutorial
/* Ochan - image board/anonymous forum Copyright (C) 2010 David Seymore 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 2 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ //package org.ochan.util; public class FileUtils { /** * The number of bytes in a kilobyte. */ public static final long ONE_KB = 1024; /** * The number of bytes in a megabyte. */ public static final long ONE_MB = ONE_KB * ONE_KB; /** * The number of bytes in a gigabyte. */ public static final long ONE_GB = ONE_KB * ONE_MB; /** * Returns a human-readable version of the file size, where the input * represents a specific number of bytes. * * @param size * the number of bytes * @return a human-readable display value (includes units in binary powers) * http://en.wikipedia.org/wiki/MiB */ public static String byteCountToDisplaySize(long size) { String displaySize; if (size / ONE_GB > 0) { float value = Float.valueOf(size).floatValue() / Float.valueOf(ONE_GB).floatValue(); displaySize = String.valueOf(Round(value, 2)) + " GiB"; } else if (size / ONE_MB > 0) { float value = Float.valueOf(size).floatValue() / Float.valueOf(ONE_MB).floatValue(); displaySize = String.valueOf(Round(value, 2)) + " MiB"; } else if (size / ONE_KB > 0) { float value = Float.valueOf(size).floatValue() / Float.valueOf(ONE_KB).floatValue(); displaySize = String.valueOf(Round(value, 2)) + " KiB"; } else { displaySize = String.valueOf(size) + " bytes"; } return displaySize; } public static float Round(float value, int numberOfPlaces) { float p = (float) Math.pow(10, numberOfPlaces); value = value * p; float tmp = Math.round(value); return (float) tmp / p; } }