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Collections

Authored by Yosuva Sirumani

Information Technology (IT)

University

Used 3+ times

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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

1. Which interface is the root interface in the Java Collection hierarchy?

A. Collection

B. Map

C. Iterable

D. List

2.

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

2. What is the main difference between ArrayList and LinkedList?

A. ArrayList is thread-safe, LinkedList is not

B. LinkedList allows duplicate elements, ArrayList doesn't

C. ArrayList uses a dynamic array, LinkedList uses nodes

D. LinkedList is faster for indexing

3.

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

3. Which of these classes implements the Set interface?

A. HashMap

B. ArrayList

C. HashSet

D. TreeMap

4.

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

4. Which method is used to remove all elements from a Collection?

A. clear()

B. deleteAll()

C. removeAll()

D. erase()

5.

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

5. What will the following code output?
Set<String> set = new HashSet<>();

set.add("Apple");

set.add("Banana");

set.add("Apple");

System.out.println(set.size());

A. 1

B. 2

C. 3

D. Compilation Error

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

6. Which class guarantees that the order of elements will remain the same as inserted?

A. HashSet

B. TreeSet

C. LinkedHashSet

D. PriorityQueue

7.

MULTIPLE CHOICE QUESTION

30 sec • 20 pts

7. What is the output of this code snippet?
Map<String, Integer> map = new HashMap<>();

map.put("A", 100);

map.put("B", 200);

map.put("A", 300);
System.out.println(map.get("A"));

A. 100

B. 200

C. 300

D. Null

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