public static void main(String[] args) throws IOException {

// test1();

// test2();

// test3();

// test4();

// test5();

// test6();

// test7();

test8();

}

private static void test8() throws IOException {

Path start = Paths.get("/Users/benny/Documents");

int maxDepth = 5;

long fileCount =

Files

.walk(start, maxDepth)

.filter(path -> String.valueOf(path).endsWith("xls"))

.count();

System.out.format("XLS files found: %s", fileCount);

}

private static void test7() throws IOException {

Path start = Paths.get("/Users/benny/Documents");

int maxDepth = 5;

Files

.find(start, maxDepth, (path, attr) ->

String.valueOf(path).endsWith("xls"))

.sorted()

.forEach(System.out::println);

}

private static void test6() throws IOException {

Files

.list(Paths.get("/usr"))

.sorted()

.forEach(System.out::println);

}

private static void test5() throws IOException {

Files

.lines(Paths.get("/foo", "bar"))

.filter(line -> line.startsWith("A"))

.forEach(System.out::println);

}

private static void test4() {

Stream

.of(new BigDecimal("1.2"), new BigDecimal("3.7"))

.mapToDouble(BigDecimal::doubleValue)

.average()

.ifPresent(System.out::println);

}

private static void test3() {

IntStream

.range(0, 10)

.average()

.ifPresent(System.out::println);

}

private static void test2() {

IntStream

.builder()

.add(1)

.add(3)

.add(5)

.add(7)

.add(11)

.build()

.average()

.ifPresent(System.out::println);

}

private static void test1() {

int[] ints = {1, 3, 5, 7, 11};

Arrays

.stream(ints)

.average()

.ifPresent(System.out::println);

}