Java 8 Lambda & Streams

3. What is the difference between the Stream.sorted() and Stream.sort() methods in Java 8?

• Stream.sorted() returns a new stream with the elements sorted, while Stream.sort() modifies the original stream in place.

• Stream.sorted() performs a stable sort, while Stream.sort() performs an unstable sort.

• Stream.sorted() accepts a Comparator as an argument, while Stream.sort() does not

• There is no difference, they are synonyms.

4. What is the purpose of the Stream.distinct() method in Java 8?

• To remove duplicate elements from the stream based on their hashcode and equals methods.

• To return a stream that contains only the first occurrence of each element in the original stream.

• To return a stream that contains only the elements that are different from their adjacent elements in the original stream.

• Don't know..

5. What is the result of applying the Stream.count() method to an empty stream in Java 8?

• 0

• 1

• null

• An exception is thrown

1. What is the output of the following code snippet?
   List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "David");

   names.stream()

   .filter(name -> name.length() > 4)

   .map(name -> name.toUpperCase())

   .forEach(System.out::println);

• ALICE BOB CHARLIE DAVID

• ALICE CHARLIE DAVID

• BOB CHARLIE DAVID

• CHARLIE DAVID

2. Which of the following is not a valid way to create a lambda expression in Java 8?

• (int x) -> x * x

• x -> x * x

• x -> { return x * x; }

• (x) -> return x * x;

3. Which of the following is a terminal operation in the Stream API in Java 8?

• map

• filter

• reduce

• all of the above

2. Which of the following is a valid way to create a date object in Java 8?

• LocalDate date = new LocalDate(2024, 2, 6);

• LocalDate date = LocalDate.of(2024, 2, 6);

• LocalDate date = LocalDate.parse(“2024-02-06”)

• Both b) and c)

6. Which of the following is a new feature introduced in Java 8 for handling exceptions?

• try-with-resources

• multi-catch

• lambda expressions

• None of the above

5. Which of the following is a new feature introduced in Java 8 for interfaces?

• Default methods

• Static methods

• Private methods

• All of the above