Java ArrayList CIP

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Question 1

List is inherited from which interface in Java?

• Formattable

• Serializable

• Collection

• None of these

Question 2

 Which class/classes among the given are among the main classes which implements the list interface?

• ArrayList

• Vector

• Linked List

• None of these

Question 3

What is special about the list's iterator compared to the collection's iterator.

• It can be constructed easily

• It can access all the data in the list

• It can traverse backward in the list.

• None of these

Question 4

What is the syntax to create an array list of integers - 

• Arraylist<Integer> al = new Arraylist<Integer>();

• Arraylist<Integer> al = new list[] ();

• Arraylist<Integer> al = new List<Integer>();

• None of these

Question 5

Advantage of ArrayList over normal array is/are, 

• Rich Library Functions

• Dynamic size

• Can access all the data at constant time

• All of the above

Question 6

How does ArrayList handle data when it is full?

• Creates a new array of double size and copies old data to this array.

• Adds space in the pre existing array.

• Cannot allocate memory more than the memory allocated to it.

• None of the above

Question 7

Average time to insert n+1 items in an ArrayList,

• θ( n + 1 )

• θ( 1 )

• θ( n )

• θ( nlogn )

Question 8

Among the given options which is/are the methods of ArrayList in Java?

• Remove

• Add

• Contains

• LastIndexOF

• All of the above

Question 9

What is the output of the code,

import java.util.*;
class HelloWorld {
   public static void main(String[] args) {
     ArrayList<Integer> al = new ArrayList<Integer>();
     al.add(10);
     al.add(20);
     al.add(30);
     al.add(40);
     al.add(50);
     System.out.println(al.isEmpty());
     al.clear();
     System.out.println(al.isEmpty());
   }
}

• false

  false

• false 

  true

• Error

• None of the above

Question 10

 What is the time complexity of remove() method of arrayList?

• O(1)

• O(n)

• O( log n )   

• None of the above

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