Plateforme d'apprentissage pour la preparation aux entretiens, les tests en ligne, les tutoriels et la pratique en direct

Developpez vos competences grace a des parcours cibles, des tests blancs et un contenu pret pour l'entretien.

WithoutBook rassemble des questions d'entretien par sujet, des tests pratiques en ligne, des tutoriels et des guides de comparaison dans un espace d'apprentissage reactif.

Rechercher dans la bibliotheque

Preparation a l'entretien

Java 8 Questions et reponses d'entretien

Test your skills through the online practice test: Java 8 Quiz Online Practice Test

Differences associees

Java 7 vs Java 8	Java 8 vs Java 9

Question 21. Provide some examples of Terminal operations.

Example of Terminal operations are:

forEach
toArray
reduce
collect
min
max
count
anyMatch
allMatch
noneMatch
findFirst
findAny

Est-ce utile ? Oui Non Ajouter un commentaire Voir les commentaires

Question 22. Given the list of numbers, remove the duplicate elements from the list.

See the following code:

Integer[] arr=new Integer[]{1,2,3,4,3,2,4,2};

List<Integer> listWithDuplicates = Arrays.asList(arr);

Set<Integer> setWithoutDups = listWithDuplicates.stream().collect(Collectors.toSet());

setWithoutDups.forEach((i)->System.out.print(" "+i));

Est-ce utile ? Oui Non Ajouter un commentaire Voir les commentaires

Question 23. Difference between Stream findFirst() and findAny().

findFirst will always return the first element from the stream whereas findAny is allowed to choose any element from the stream.
findFirst has deterministic behavior whereas findAny is nondeterministic behavior.

Est-ce utile ? Oui Non Ajouter un commentaire Voir les commentaires

Question 24. What is consumer function interface?

It is a functional interface defined in java.util.function package. It contains an abstract accept() and a default andThen() method. It can be used as the assignment target for a lambda expression or method reference.

Consumer is single argument functional interface which does not return any value.

public static void main(String[] args) {

Consumer<String> consumerString = s->System.out.println(s);

consumerString.accept("John");

}

We have created consumer object which takes String object as input and print it. It is simple use of Consumer interface to print String.

Output:

John

Est-ce utile ? Oui Non Ajouter un commentaire Voir les commentaires

Question 25. What is predicate function interface?

Predicate is single argument function which returns true or false. It has test method which returns boolean. Usually, it used to apply in a filter for a collection of objects.

public static void main(String[] args) {

Predicate<Integer> predicate = i -> i > 100;

boolean greaterCheck = predicate.test(200);

System.out.println("is 200 greater than 100: "+greaterCheck);

}

Output:

is 200 greater than 100: true

Est-ce utile ? Oui Non Ajouter un commentaire Voir les commentaires

Les plus utiles selon les utilisateurs :