import java.io.File;
import java.io.FileNotFoundException;

class FileNotDirectoryException extends Exception {
    public FileNotDirectoryException(String message) {
        super(message);
    }
}

public class Main {
    public static void main(String[] args) {
        File[] files = (getFilesInFolder("/home/alek/Desktop/"));
        for (File f : files) {
            System.out.println(f.getName());
        }
    }

    public static File[] getFilesInFolder(String path) {
        try {
            File f = new File(path);
            if (!f.exists()) {
                throw new FileNotFoundException("The file \"" + path + "\" doesn't exist.");
            }
            if (!f.isDirectory()) {
                throw new FileNotDirectoryException("The file \"" + path + "\" isn't a directory.");
            }

            return f.listFiles();

        } catch (FileNotFoundException | FileNotDirectoryException e) {
            System.err.println(e.getMessage());
        }

        return new File[0]; // In case of any errors, an empty list is returned
    }
}