Data Structure and Algorithms using Java Week 2 Nptel Answers

Last updated: August 2, 2025

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Data Structure and Algorithms using Java Week 2 Nptel Answers (July-Dec 2025)

Question 1. Which of the following interfaces are NOT descendants of java.util.Collection?
a) java.util.SortedMap
b) java.util.Set
c) java.util.SortedSet
d) java.util.Queue

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Question 2. Which of the following statements is not true for Java?
a) Java supports the basic data structures like arrays and linked lists.
b) Java does not support complex data structures.
c) Java provides built-in support for data structures through the Java Collections Framework.
d) A collection in Java is any group of objects.

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Question 3. Which of the following are valid ways to declare collection-based data structures in Java?
a) List<Integer> list = new ArrayList<>();
b) Map<string> map = new HashMap<>();
c) Set<String> set = new HashSet<>();
d) Queue<Integer> queue = new PriorityQueue<>();

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Question 4. What will be the output of the following code snippet?

import java.util.*;
public class TestQ4 {
  public static void main(String[] args) {
    List<Number> list = new ArrayList<>();
    list.add(2);
    list.add(2.0);
    System.out.println(list);
  }
}

a) [2, 2.0]
b) [20, 2]
c) Compilation Error – can’t mix int and double
d) Runtime Error – incompatible types

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Question 5. Which of the following operations are NOT supported by the SortedSet interface?
a) Adding elements
b) Sorting elements explicitly
c) Retrieving by index
d) Removing elements

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Question 6. What is the error in the following code?

import java.util.*;
class Test {
  public static void main(String[] args) {
    HashSet<String> set = new HashSet<>();
    set.add("apple");
    set.add("banana");
    set.add("apple");
    System.out.println(set);
  }
}

a) Compilation Error
b) Runtime Error – duplicate element
c) No error; duplicate is ignored
d) Output always matches insertion order

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Question 7. Which of the following are part of the Map framework in Java?
a) TreeMap
b) HashMap
c) LinkedList
d) Hashtable

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Question 8. What is the output of the following code?

import java.util.*;
public class TestQ8 {
  public static void main(String[] args) {
    SortedMap<Integer, String> map = new TreeMap<>();
    map.put(3, "Apple");
    map.put(1, "Banana");
    map.put(4, "Cherry");
    map.put(2, "Date");
    System.out.println(map);
  }
}

a) {3=Apple, 1=Banana, 4=Cherry, 2=Date}
b) {1=Banana, 2=Date, 3=Apple, 4=Cherry}
c) {Apple=3, Banana=1, Cherry=4, Date=2}
d) Compilation Error

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Question 9. Which of the following is NOT a legacy class or interface in Java?
a) Hashtable
b) Enumeration
c) Queue
d) Vector

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Question 10. What is the output of the following code?

import java.util.*;
public class TestQ10 {
  public static void main(String[] args) {
    Vector<String> vec = new Vector<>();
    vec.add("A");
    vec.add("B");
    vec.remove(1);
    vec.add("C");
    System.out.println(vec);
  }
}

a) [A, C]
b) [B, C]
c) [A, B, C]
d) [A]

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Data Structure and Algorithms using Java Week 2 Nptel Answers (July-Dec 2024)

Course Link: Click Here

Q1.Which of the following classes is part of the Java Collections Framework and implements the List interface?
a. HashSet
b. LinkedList
c. TreeMap
d. PriorityQueue

Answer: b. LinkedList

Q2. Which of the following is True in the case of Java Collection Framework(JCF)?
a. JCF provides mid-performance software encoding
b. Extending and/or adapting a collection is easy and not flexible with JCF
c. The JCF is consist of : Collections and Facilities
d. The JCF doesn’t allow different types of collections to work with a high degree of interoperability.

Answer: c. The JCF is consist of : Collections and Facilities

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