Here you can find the source of formatFileSize(double size)
public static String formatFileSize(double size)
//package com.java2s; //License from project: Apache License import java.math.BigDecimal; public class Main { public static String formatFileSize(double size) { double kiloByte = size / 1024; if (kiloByte < 1) { return size + "Byte(s)"; }//from www. j a v a2s. co m double megaByte = kiloByte / 1024; if (megaByte < 1) { BigDecimal result1 = new BigDecimal(Double.toString(kiloByte)); return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB"; } double gigaByte = megaByte / 1024; if (gigaByte < 1) { BigDecimal result2 = new BigDecimal(Double.toString(megaByte)); return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB"; } double teraBytes = gigaByte / 1024; if (teraBytes < 1) { BigDecimal result3 = new BigDecimal(Double.toString(gigaByte)); return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB"; } BigDecimal result4 = new BigDecimal(teraBytes); return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB"; } }