Java Utililty Methods File Size Readable Format

List of utility methods to do File Size Readable Format

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Description

The list of methods to do File Size Readable Format are organized into topic(s).

Method

StringformatSize(long size)
format Size 
long SIZE_KB = 1024;
long SIZE_MB = SIZE_KB * 1024;
long SIZE_GB = SIZE_MB * 1024;
if (size < SIZE_KB) {
    return String.format("%d B", (int) size);
} else if (size < SIZE_MB) {
    return String.format("%.2f KB", (float) size / SIZE_KB);
} else if (size < SIZE_GB) {
...
StringformatSize(Long size)
Formats a file size. 
if (size == null) {
    return null;
int unit = 1024;
if (size < unit) {
    return String.format("%d B", size);
int exp = (int) (Math.log(size) / Math.log(unit));
...
StringformatSize(long size)
format Size 
if (size == -1) {
    return "UNKNOWN";
long kb = size / 1024;
if (kb == 0) {
    return size + "B";
long mb = kb / 1024;
...
StringFormatSize(long size)
Format Size 
String suffix = null;
if (size >= 1024) {
    suffix = "KB";
    size /= 1024;
    if (size >= 1024) {
        suffix = "MB";
        size /= 1024;
StringBuilder resultBuffer = new StringBuilder(Long.toString(size));
int commaOffset = resultBuffer.length() - 3;
while (commaOffset > 0) {
    resultBuffer.insert(commaOffset, ',');
    commaOffset -= 3;
if (suffix != null) {
    resultBuffer.append(suffix);
return resultBuffer.toString();
StringformatSize(long v)
format Size 
if (v < 1024)
    return v + " B";
int z = (63 - Long.numberOfLeadingZeros(v)) / 10;
return String.format("%.1f %sB", (double) v / (1L << (z * 10)), " KMGTPE".charAt(z));
StringformatSize(String strSize)
Formats the given size for display in a directory listing 
String strFormattedSize = strSize;
int length = strSize.length();
if (length < 4) {
    strFormattedSize = strSize + "B";
} else if (length >= 4 && length < 7) {
    String strLeft = strSize.substring(0, length - 3);
    String strRight = strSize.substring(length - 3, length - 2);
    StringBuilder buffer = new StringBuilder(strLeft);
...
StringBuilderformatSize(StringBuilder builder, Long size)
format Size 
if (size == null) {
    builder.append("???");
    return builder;
int n = 1024 * 1024 * 1024;
int type = 0;
while (size < n && n >= 1024) {
    n /= 1024;
...
StringformatSizeInBytes(int size)
format Size In Bytes 
if (size < 1)
    return size + "B";
for (int i = 0; i < (UNITS.length - 1); i++) {
    if (size < UNIT_THRESH[i + 1])
        return (int) (size / UNIT_THRESH[i]) + UNITS[i] + "B";
return size + "B";
StringformatSpaceUsage(long size)
format Space Usage 
if (size < 1e4)
    return size + "B";
else if (size < 1e7)
    return "" + Math.round(1D * size / 1024D) + "KB";
else if (size < 1e10)
    return "" + Math.round(1D * size / 1e6) + "MB";
else
    return "" + Math.round(1D * size / 1e9) + "GB";
...
StringformatToolBarDisplay(String text, int size)
format Tool Bar Display 
if (text.equals("-1")) {
    text = "Mixed";
int textSize = text.length();
int rem = size - textSize;
if (rem > 0) {
    int newSize = rem / 2;
    for (int i = 0; i < newSize; i++) {
...