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Java Vector

Here are 10 essential multiple-choice questions on Java Vector, covering key concepts.

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Question 1

Which package contains the Vector class in Java?

java.collection
java.util
java.list
java.vector

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Question 2

How does Vector handle concurrent modifications?

It uses synchronized methods
It uses volatile keyword
It does not support concurrency
It throws ConcurrentModificationException

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Question 3

What will be the output of the following code?

Java

import java.util.*;
public class Test {
    public static void main(String[] args) {
        Vector<Integer> vector = new Vector<>(2);
        vector.add(10);
        vector.add(20);
        vector.add(30);
        System.out.println(vector.capacity());
    }
}

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Question 4

Which method retrieves, but does not remove, the first element of a Vector?

peek()
firstElement()
head()
getFirst()

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Question 5

What will be the output of the following code?

Java

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

[A, C]
[B, C]
[A, B, C]
[A, C, B]

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Question 6

What is the default initial capacity of a Vector in Java?

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Question 7

Which of the following statements about Vector and ArrayList is true?

Vector is synchronized, whereas ArrayList is not
ArrayList is synchronized, whereas Vector is not
Both are synchronized
Neither is synchronized

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Question 8

What will be the result of the following code?

Java

import java.util.*;
public class Test {
    public static void main(String[] args) {
        Vector<Integer> vector = new Vector<>();
        vector.add(5);
        vector.add(10);
        vector.add(15);
        System.out.println(vector.elementAt(2));
    }
}

5
10
15
IndexOutOfBoundsException

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Question 9

How does Vector differ from ArrayList when resizing?

Vector doubles its size, ArrayList increases by 50%
ArrayList doubles its size, Vector increases by 50%
Both increase their size by 50%
Both double their size

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Question 10

Which method removes all elements from a Vector?

clear()
removeAll()
deleteAll()
flush()

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