Deeply Search Files In Given Directory Java - Recursive Way

For one of my Java projects I need to search files and directories within given directory, so i need to come up with optimal solution cause when i searched a little for this problem the codes floating around are just useless some of them not searching in a deep way or some of them are written in a poor way. So I come up with my own solution that do the job with recursive way. Here is a code for that.

public void deepRecSearch( File givenDir ) throws IOException {
    if (givenDir.isDirectory()) {
        final File[] childs = givenDir.listFiles();
        for( File child : childs ) {
           deepRecSearch(child);
        }    
        return;
    }
//put your implementation about file here
//like what you wanna do with that file print absolutePath or sth
}