Here you can find the source of formatSize(long sizeInBytes)
public static String formatSize(long sizeInBytes)
//package com.java2s; /*/*from ww w.j a v a 2 s.c o m*/ * Copyright (c) 2008 - Tomas Janecek. * * 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 St, Fifth Floor, Boston, MA 02110-1301 USA */ import java.text.DecimalFormat; public class Main { private static final String[] SIZE_NAMES = { "B", "kB", "MB", "GB", "TB" }; public static String formatSize(long sizeInBytes) { double displaySize = sizeInBytes; int unitIndex; for (unitIndex = 0; unitIndex < SIZE_NAMES.length; unitIndex++) { if (displaySize < 1024) { break; } displaySize = displaySize / 1024.0; } DecimalFormat decimalFormat = new DecimalFormat("#.##"); return decimalFormat.format(displaySize) + SIZE_NAMES[unitIndex]; } }