Java Size Format formatFileSize(double fileSize, int precision, int unit, boolean showUnit)

Description

Returns the file size.

License

Apache License

Parameter

Parameter	Description
fileSize	The size of the file, also see File#length() .
precision	The decimal places.
unit	Use #KB , #MB #GB , or #TB .
showUnit	Use true , or false .

Return

the string

Declaration

public static String formatFileSize(double fileSize, int precision, int unit, boolean showUnit) 

Method Source Code

//package com.java2s;
/*//  ww  w  .j  a  va  2 s. co  m
 * Copyright (c) 2016 Martin Pfeffer
 *
 * 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 final int KB = 0;
    public static final int MB = 1;
    public static final int GB = 2;
    public static final int TB = 3;

    /**
     * Returns the file size.
     *
     * @param fileSize  The size of the file, also see {@link File#length()}.
     * @param precision The decimal places.
     * @param unit      Use {@link #KB}, {@link #MB} {@link #GB}, or {@link #TB}.
     * @param showUnit  Use {@code true}, or {@code false}.
     * @return the string
     */
    public static String formatFileSize(long fileSize, int precision, int unit, boolean showUnit) {
        String s = "#,";
        for (int i = 0; i < precision; i++)
            s += "#";
        DecimalFormat df = new DecimalFormat(s);
        return applyDecimalFormat(fileSize, unit, df, showUnit);
    }

    /**
     * Returns the file size.
     *
     * @param fileSize  The size of the file, also see {@link File#length()}.
     * @param precision The decimal places.
     * @param unit      Use {@link #KB}, {@link #MB} {@link #GB}, or {@link #TB}.
     * @param showUnit  Use {@code true}, or {@code false}.
     * @return the string
     */
    public static String formatFileSize(double fileSize, int precision, int unit, boolean showUnit) {
        String s = "#,";
        for (int i = 0; i < precision; i++)
            s += "#";
        DecimalFormat df = new DecimalFormat(s);
        return applyDecimalFormat((long) fileSize, unit, df, showUnit);
    }

    /**
     * Apply decimal format string.
     *
     * @param fileSize the file size
     * @param unit     the unit
     * @param df       the df
     * @param b        the b
     * @return the string
     */
    private static String applyDecimalFormat(long fileSize, int unit, DecimalFormat df, boolean b) {
        switch (unit) {
        case MB:
            return df.format(fileSize / Math.pow(1024, 2)) + (b ? " MB" : "");
        case GB:
            return df.format(fileSize / Math.pow(1024, 3)) + (b ? " GB" : "");
        case TB:
            return df.format(fileSize / Math.pow(1024, 4)) + (b ? " TB" : "");
        case KB:
        default:
            return df.format(fileSize / 1024) + (b ? " KB" : "");
        }
    }
}

Related

1. formatByteSize(long bytes)
2. formatDataSize(final double dataSize)
3. formatDataSize(long bytes)
4. formatDecimal(double size)
5. formatDiskSize(final long diskSize)
6. formatFileSize(File file)
7. formatFilesize(final long filesize, final Locale locale)
8. formatFilesize(int s)
9. formatFileSize(long fileS)