Here you can find the source of formatFileSize(long size)
public static String formatFileSize(long size)
//package com.java2s; /*/*www.j av a 2 s.c om*/ * Gruntspud * * Copyright (C) 2002 Brett Smith. * * Written by: Brett Smith <t_magicthize@users.sourceforge.net> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Library 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 Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ import java.text.DecimalFormat; import java.text.NumberFormat; public class Main { private final static NumberFormat FILE_SIZE_FORMAT = new DecimalFormat(); /** * */ public static String formatFileSize(long size) { double bytes = (double) size; if (bytes < 1024) { return String.valueOf((int) bytes) + " bytes"; } else if (bytes < 1048576) { return FILE_SIZE_FORMAT.format(bytes / 1024) + " K"; } else { return FILE_SIZE_FORMAT.format(bytes / 1024 / 1024) + " MB"; } } }