Here you can find the source of formatSize(long fileSize)
public static String formatSize(long fileSize)
//package com.java2s; /*/*from w ww.jav a 2 s . c o m*/ * Jvifm - Java vifm (File Manager with vi like key binding) * * Copyright (C) 2006 wsn <shrek.wang@gmail.com> * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ import java.text.*; public class Main { private static DecimalFormat df = new DecimalFormat("#.##"); public static String formatSize(long fileSize) { if (fileSize < 1024) { return String.valueOf(fileSize) + "bytes"; } else if (fileSize >= 1024 && fileSize < 1048576) { float temp = (float) fileSize / 1024; return df.format(temp) + "Kb"; } else if (fileSize >= 1048576 && fileSize < 1073741824) { float temp = (float) fileSize / 1048576; return df.format(temp) + "Mb"; } else { float temp = (float) fileSize / (1048576 * 1024); return df.format(temp) + "Gb"; } } }