Here you can find the source of formatBytes(double size)
public static String formatBytes(double size)
//package com.java2s; /*/* w ww. j a v a 2 s . co m*/ * Copyright 2009-2013 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.text.DecimalFormat; public class Main { public static String formatBytes(double size) { double k = size / 1024.0; double m = k / 1024.0; double g = m / 1024.0; DecimalFormat dec = new DecimalFormat("0"); if (g > 1) { return dec.format(g).concat("G"); } else if (m > 1) { return dec.format(m).concat("M"); } else if (k > 1) { return dec.format(k).concat("K"); } else { return dec.format(size).concat("B"); } } }