Evaluation Du Cours Java Collections
Ce quiz a pour but D'évaluer vos connaissances sur le cours "Collections JAVA".N'essayez pas de répondre a toutes les questions, ce Quiz a juste pour ambition d'évaluer votre niveau de maitrise du sujet !
- 1.// dans une méthode main // création du set Set<String> set = new HashSet<String>() ; // ajout d'élément System.out.println("J'ajoute un : " + set.add("un")) ; System.out.println("J'ajoute deux : " + set.add("deux")) ; // ajout d'un doublon : échec System.out.println("J'ajoute encore un : " + set.add("un")) ; // affichage de la taille du set System.out.println("Taille du set : " + set.size()) ;
- 2.What are we referring to when we mention java.util.Collections ?
- A.
The interface from which lists, queues and sets extend
- B.
The Collections framework
- C.
A utilility class for use with collections
- D.
We never mention this
- 3.What type of collection would we use if we wanted no duplicates?
- A.
List
- B.
Map
- C.
Queue
- D.
Set
- 4.What type of List is used with synchronized access?
- A.
ArrayList
- B.
Vector
- C.
LinkedList
- 5.Question 4 :What type of collection does not extend the Collection<E> interface?
- A.
List
- B.
Map
- C.
Queue
- D.
Set
- 6.What type of Map is used with synchronized access?
- A.
HashMap
- B.
LinkedHashMap
- C.
Hashtable
- D.
Set
- 7.There are no direct implementation of the Collection interface?
- A.
True
- B.
False
- 8.What type of collection has always been type safe
- A.
Array
- B.
List
- C.
Map
- D.
Queue
- E.
Set
- 9.What is the following code snippet an example of <T extends Number> ?
- A.
bounded type
- B.
Generic type
- C.
Bounded wildcard type
- D.
unbounded wildcard type
- 10.We can use generics with any type?
- A.
True
- B.
False
- 11.How are generics implemented?
- A.
Asymmetry
- B.
Erasure
- C.
Reification
- D.
Reflection
- 12.What is the following code snippet an example of ?
- A.
Bounded type
- B.
generic type
- C.
Bounded wildcard type
- D.
Unbounded wildcard type
- 13.Is the following code snippet valid? ListaList = new ArrayList();
- A.
YES
- B.
NO
- 14.Is the following code snippet valid?public class SimpleGenericInterfaceImpl implements SimpleGenericInterface { ?
- A.
YES
- B.
NO
- 15.Question 14:What is the following code snippet an example of <? extends Number> ?
- A.
Bounded type
- B.
Generic type
- C.
Bounded wildcard type
- D.
Unbounded wildcard type
- 16.What do sets care about
- A.
Index
- B.
Speed
- C.
Uniqueness
- 17.What type of set would you use if you wanted a fast access ordered set but didn't care about sorting?
- A.
HashSet
- B.
LinkedHashSet
- C.
TreeSet
- 18.Can we have a sorted and unordered set?
- A.
YES
- B.
NO
- 19.What type of set would you use if you wanted fast access and didn't care about ordering?
- A.
HashSet
- B.
LinkedHashSet
- C.
TreeSet
- 20.What type of exception is raised when we run a program with objects that are not mutually comparable in a sorted set?
- A.
NONE
- B.
ClassCastException
- C.
RuntimeException
- D.
OutOfBoundsException
- 21.What type of set would you use if you wanted it sorted?
- A.
HashSet
- B.
LinkedHashSet
- C.
TreeSet
- 22.Which type of list implements the Queue interface
- A.
ArrayList
- B.
LinkedList
- C.
Vector
- 23.What type of collections are Lists?
- A.
Ordered
- B.
Sorted
- C.
Unordered
- 24.Which List class is synchronized?
- A.
ArrayList
- B.
LinkedList
- C.
Vector
- 25.What do Lists have in common?
- A.
An index
- B.
Element uniqueness
- C.
Nothing
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