import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class Main {
public static void main(String[] args) throws Exception{
Path start = Paths.get("c:/Java_Dev/");
int maxDepth = 5;
Files
.find(start, maxDepth, (path, attr) ->String.valueOf(path).endsWith("xls"))
.sorted()
.forEach(System.out::println);
}
}