How to delete a whole folder and content?
Source: StackOverflow
Question: How to delete a whole folder and content?
Answer: You can delete files and folders recursively like this:
void deleteRecursive(File fileOrDirectory) {
    if (fileOrDirectory.isDirectory())
        for (File child : fileOrDirectory.listFiles())
            deleteRecursive(child);
    fileOrDirectory.delete();
}