Java Utililty Methods Root Directory Get

return new File(".");

if (root != null)
    root = new File("").getAbsolutePath();
return root;

try {
    return new File("/").getCanonicalPath();
} catch (final IOException ex) {
    throw new RuntimeException(ex);

return System.getProperty("user.dir") + String.format("%ssrc%stest%sfiles%s", File.separator,
        File.separator, File.separator, File.separator);

System.out.print("Detecting OS... ");
final String name = System.getProperty("os.name").toLowerCase();
File root;
if (name.contains("win"))
    root = new File(System.getenv("APPDATA") + File.separator + ".minecraft");
else if (name.contains("mac"))
    root = new File(
            System.getProperty("user.home") + File.separator + "Library/Application Support/minecraft");
...

if (rootPath == null) {
    try {
        File rootDir = new File(ClassLoader.getSystemClassLoader().getResource(".").toURI().getPath());
        rootPath = rootDir.getAbsolutePath();
        if (rootPath.endsWith("bin")) {
            rootPath = rootPath.substring(0, rootPath.length() - "bin".length());
        } else if (rootPath.endsWith("target" + File.separator + "classes")) {
            rootPath = rootPath.substring(0,
...

File root = null;
File tmp = child;
root = tmp;
while (tmp != null) {
    root = tmp;
    tmp = tmp.getParentFile();
if ("\\\\".equals(root.getPath())) { 
...

File parent = file;
while (parent.getParentFile() != null)
    parent = parent.getParentFile();
return parent;

File tmp = file.getParentFile();
File rtn = null;
for (; tmp != null; rtn = tmp, tmp = tmp.getParentFile())
    ;
return rtn;

if (file != null && lst != null && lst.size() > 0) {
    for (File f : lst) {
        if (file.equals(f)) {
            return f;
    return getRoot(file.getParentFile(), lst);
return null;