Java Utililty Methods File Size Get

return Long.parseLong(file.length() + "");

return getFileSize(file, null);

if (file.isDirectory()) {
    long foldersize = 0;
    File[] filelist = file.listFiles();
    for (int i = 0; i < filelist.length; i++) {
        foldersize += getFileSize(filelist[i]);
    return foldersize;
} else {
...

long fileSize = 0;
if (file.exists()) {
    if (file.isDirectory()) {
        File[] files = file.listFiles();
        for (int i = 0; i < files.length; i++) {
            fileSize += getFileSize(files[i]);
    } else {
...

if (file == null)
    return 0L;
if (file.isFile())
    return file.length();
if (!file.isDirectory())
    return 0L;
File[] subFiles = file.listFiles();
if (subFiles == null)
...

if (!file.exists()) {
    return 0L;
if (file.isDirectory()) {
    long size = 0L;
    for (File subfile : listFiles(file)) {
        size += getFileSize(subfile);
    return size;
return file.length();

return getFormatSize(file.length());

if (file.exists()) {
    return file.length();
} else {
    return 0;

long num = 0L;
for (File file : files) {
    if (file.isDirectory()) {
        num += getFileSize(file.listFiles());
    } else {
        num += file.length();
return num;

File f;
try {
    f = new File(filename);
    if (f.exists()) {
        return f.length();
} catch (final Exception e) {
return -1;