Turns a long byte size into a human-readable String . - Java java.lang

Java examples for java.lang:byte Array to int

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Description

Turns a long byte size into a human-readable String .

Demo Code

/*/*ww  w. j ava2 s  .c  o  m*/
 * 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.
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        long size = 2;
        boolean si = true;
        System.out.println(getHumanReadable(size, si));
    }

    /**
     * Turns a {@code long} byte size into a human-readable {@link String}.
     *
     * @param size
     *            the byte size to display
     * @param si
     *            {@code true} to use the units of the international system (kb), {@code false} to
     *            use the IEC units (KiB, MiB, ...)
     * @return a human-readable byte size
     */
    public static String getHumanReadable(long size, boolean si) {
        /*
         * Provided by aioobe
         *
         * http://stackoverflow.com/questions/3758606/how-to-convert-byte-size-into
         * -human-readable-format-in-java
         */
        int unit = si ? 1000 : 1024;
        if (size < unit) {
            return size + " B";
        }
        int exp = (int) (Math.log(size) / Math.log(unit));
        String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1)
                + (si ? "" : "i");
        return String.format("%.1f %sB", size / Math.pow(unit, exp), pre);
    }
}

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