How to find the wood of the folder of the inner folder

[Oba22]

I'm doing a code to build a tree from the files and files. Initially, my code gets something, and if it's empty. if (!file.exists()) returns empty Stringif there's a file that returns the name of the file.

public Optional<String> tree(Path path) {
    File file = new File(String.valueOf(path));
    if (!file.exists()) {
        return Optional.empty();
    } else if (file.isFile()) {
        return Optional.of(file.getName());
    } else if (file.isDirectory()) {
        ...

    }
    return null;
}

Difficulties start when there's a file. In this case, I have to see what's in it and if there's a file to see what's in it and so on. Trying to do it with help. if-else but this design works only to the level of the design. if-elseand I need to keep it out of line, and the program gives the whole chick's results.

else if (file.isDirectory()) {

System.out.println(file.getName());

        File[] filesArray = file.listFiles();
        for (File filer : filesArray) {

            if (filer.isFile()) {

                System.out.println(filer.getName());
            } else if (filer.isDirectory()) {

                System.out.println(filer.getName());
                File[] filesArrays = filer.listFiles();
                for (File filers : filesArrays) {
                    if (filers.isFile()) {
                        System.out.println(filers.getName());
                    }
                }
            } else {
                System.out.println(filer.getName());
            }

In this design, the result has been obtained, but if there is a folder inner 1.1 in the file, the same result will be:

test1

inner1

some.txt

some1.txt

some.txt

some1.txt

some2.txt

[irl]

See if you can use a lesson for this purpose:

    void printRecursiveTree(Path path) {
        File file = new File(String.valueOf(path));
        if (file.isFile()) {
            System.out.println(file.getName());
        } else if (file.isDirectory()) {
            File[] filesArray = file.listFiles();
            for (File filer : filesArray) {
                printRecursiveTree(filer.toPath());
            }
        }
    }

A small bonus, you can make a tree of files more realistic by taking off:

    void printRecursiveTree(Path path, int level) {
        File file = new File(String.valueOf(path));
        if (file.isFile()) {
            System.out.println(" ".repeat(level) + file.getName());
        } else if (file.isDirectory()) {
            File[] filesArray = file.listFiles();
            for (File nestedFile : filesArray) {
                printRecursiveTree(nestedFile.toPath(), level + 1);
            }
        }
    }

Purpose:

        printRecursiveTree(Path.of("C:/Users/oQaris/Desktop/Git"), 0);