Java Utililty Methods File Size Get

String displaySize;
if (size / ONE_GB > 0) {
    displaySize = format(Math.floor(size * 100.0 / ONE_GB) / 100) + "G";
} else if (size / ONE_MB > 0) {
    displaySize = format(Math.floor(size * 100.0 / ONE_MB) / 100) + "M";
} else if (size / ONE_KB > 0) {
    displaySize = format(Math.floor(size * 100.0 / ONE_KB) / 100) + "K";
} else {
...

String fileSizeString = "";
try {
    File file = new File(pathname);
    DecimalFormat df = new DecimalFormat("#.00");
    long fileS = file.length();
    if (fileS < 1024) {
        fileSizeString = "0byte";
    } else if (fileS < 1048576) {
...

ensureFormat();
final StringBuffer result = new StringBuffer(64);
double value;
if (bytes >= ONE_GB) {
    value = scaleToThreeDecimals(bytes, ONE_GB);
    result.append(format.format(value));
    result.append(" GB");
} else if (bytes >= ONE_MB) {
...

if (fsize < 0) {
    throw new IllegalArgumentException("File size can't be nagetive.");
long size = fsize / 1000;
long li = fsize % 1000;
if (li > 0) {
    size++;
return NumberFormat.getInstance().format(size) + " KB";

if (!file.exists()) {
    return -1L;
long size = 0;
if (file.isDirectory()) {
    File[] files = file.listFiles();
    if (files != null && files.length > 0) {
        for (File f : files) {
...

long size = 0;
if (dir.isFile()) {
    size = dir.length();
} else {
    File[] subFiles = dir.listFiles();
    for (File file : subFiles) {
        if (file.isFile()) {
            size += file.length();
...

if (element.isDirectory()) {
    return "";
} else {
    long filesizeInKb = ((element.length() + 512) / 1024);
    return "" + numberFormat.format(filesizeInKb) + " KB";

long s = 0;
if (f.exists()) {
    FileInputStream fis = null;
    try {
        fis = new FileInputStream(f);
        s = fis.available();
    } catch (Exception e) {
        e.printStackTrace();
...

String size;
long bytes = file.length();
if (bytes == 0) {
    size = "";
} else if (bytes < 1024) {
    size = bytes + "b";
} else {
    float kb = bytes / 1024F;
...

return file.length();