Java Utililty Methods Path Create

return makePath(files, File.pathSeparator);

File p = copyTo.getParentFile();
if (p == null) {
    return;
if (!p.exists()) {
    if (!p.mkdirs()) {
        throw new IOException("Could not create directory: " + p.getAbsolutePath());

String prefix = "", suffix = "";
if (path.startsWith("jar:file:")) {
    prefix = "jar:file:";
    int exclamation = path.indexOf('!');
    suffix = path.substring(exclamation);
    path = path.substring(prefix.length(), exclamation);
if (isAbsolutePath(path))
...

StringBuilder sb = new StringBuilder();
for (String jar : jars) {
    if (sb.length() > 0)
        sb.append(File.pathSeparator);
    sb.append(dir).append(File.separator).append(jar);
return sb.toString();

File path = new File(basePath);
try {
    if (!path.exists()) {
        if (!path.mkdirs())
            if (!path.exists())
                throw new RuntimeException("Failed to create directory:" + basePath);
    } else if (!path.isDirectory()) {
        throw new RuntimeException("Something is already has this name, and it's not a dir: " + basePath);
...

int hashcode = filename.hashCode();
int dir1 = hashcode & 0xf; 
int dir2 = (hashcode & 0xf0) >> 4; 
String dir = savePath + File.separator + dir1 + File.separator + dir2;
File file = new File(dir);
if (!file.exists()) {
    file.mkdirs();
    file.setWritable(true, false);
...

if (path1.endsWith(File.separator))
    return path1 + path2;
return path1 + File.separator + path2;

return String.join(File.separator, elements);

return join(File.separator, elements);

String result = "";
for (int i = 0; i < strings.length; i++)
    result += File.separator + strings[i];
return result;