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import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;

public class FileCount {
    public FileCount() {
        /*
        sample path
        $ tree
        .
        ├── dir1
        │   ├── dir1-1
        │   │   └── test.txt
        │   ├── dir1-2
        │   │   └── test.txt
        │   ├── tes.txt
        │   └── test.html
        └── dir2
            └── test.html
         */
        System.out.println(countFile(Paths.get("To sample path"), "txt"));
    }

    public long countFile(Path path, final String extension) {
        try (Stream<Path> stream = Files.walk(path)) {
            return stream
                    .filter(entry ->
                            entry.getFileName().toString().endsWith(String.format(".%s", extension)))
                    .count();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return 0L;
    }

    public static void main(String args[]) {
        new FileCount();
    }
}