Java Utililty Methods File Rename

if (!file.exists()) {
    return;
File dest = new File(file.getParent(), file.getName() + ext);
boolean success = file.renameTo(dest);
if (success) {
    System.out.println("[INFO] Rename Session LOG " + dest);
} else {
...

String filePath = file.getAbsolutePath();
String fileName = file.getName();
String newFilePath = filePath.substring(0, filePath.length() - fileName.length()) + name;
File newFile = new File(newFilePath);
file.renameTo(newFile);
return newFile;

if (file.exists() == false)
    return false;
String path = file.getPath();
File new_file = new File(path + File.separator + newFilename);
return file.renameTo(new_file);

file.renameTo(new File(newName));

if (file.exists()) {
    File dest = new File(file.getParentFile(), newName);
    if (file.renameTo(dest)) {
        return dest;
return null;

String properPath = file.getPath().substring(0, file.getPath().lastIndexOf(File.separator));
String newNameWithoutExt = newName.substring(0,
        newName.lastIndexOf(".") == -1 ? newName.length() : newName.lastIndexOf("."));
return new File((properPath + File.separator + newNameWithoutExt + ".srt").replaceAll("\\s", "_"));

if (file == null)
    throw new NullPointerException("file must not be null");
if (!file.isFile() || !file.exists())
    throw new IllegalArgumentException("file must not be a file and exists");
File newFile = new File(file.getParent() + "/" + newName);
file.renameTo(newFile);

String name = file.getAbsolutePath();
int index = name.lastIndexOf(suffix);
String newName = name.substring(0, index) + "_" + sign + name.substring(index, name.length());
file.renameTo(new File(newName));

source.renameTo(dest);

File targetFile = new File(sourceFile.getParent(), newFileName);
sourceFile.renameTo(targetFile);