Here you can find the source of stringify(long byteNumber)
public static String stringify(long byteNumber)
//package com.java2s; /**//from w w w . j a va 2 s . c om * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 { private final static long KB_IN_BYTES = 1024; private final static long MB_IN_BYTES = 1024 * KB_IN_BYTES; private final static long GB_IN_BYTES = 1024 * MB_IN_BYTES; private final static long TB_IN_BYTES = 1024 * GB_IN_BYTES; private final static DecimalFormat df = new DecimalFormat("0.00"); /** Formatter byte to kb,mb or gb etc. */ public static String stringify(long byteNumber) { if (byteNumber / TB_IN_BYTES > 0) { return df.format((double) byteNumber / (double) TB_IN_BYTES) + "TB"; } else if (byteNumber / GB_IN_BYTES > 0) { return df.format((double) byteNumber / (double) GB_IN_BYTES) + "GB"; } else if (byteNumber / MB_IN_BYTES > 0) { return df.format((double) byteNumber / (double) MB_IN_BYTES) + "MB"; } else if (byteNumber / KB_IN_BYTES > 0) { return df.format((double) byteNumber / (double) KB_IN_BYTES) + "KB"; } else { return String.valueOf(byteNumber) + "B"; } } }