How to Implement a Custom Vector with Additional Functionality in Java?

Last Updated : 23 Feb, 2024

In Java, the Vector class is a part of the Java Collections Framework providing the Dynamic Arrays that can be resized. However, there might be scenarios where you need a Custom Vector with additional functionality tailored to your specific requirements.

Prerequisite

To follow along, you should have a Basic understanding of Java programming particularly knowledge of classes, arrays, and Java Collections Framework.

Example

Java

// Java Program to  implement a custom
// Vector with additional functionality
import java.io.*;
import java.util.Vector;

// CustomVector class extending Vector
class GFG<E> extends Vector<E> {
    // Method to calculate sum of elements
    public int calculateSum() {
        int sum = 0;
        // Iterating over elements
        for (E element : this) {
            // Checking if element is an Integer
            if (element instanceof Integer) {
                // Adding element to sum
                sum += (Integer) element;
            }
        }
        // Return sum of elements
        return sum;
    }
}

// Driver Class
public class Main {
    // Main Function
    public static void main(String[] args) {
        // Creating an instance of the CustomVector
        GFG<Integer> customVector = new GFG<>();

        // Adding elements to custom vector
        customVector.add(10);
        customVector.add(20);
        customVector.add(30);

        // Calculating the sum using custom method
        int sum = customVector.calculateSum();

        // Displaying the result
        System.out.println("Sum of elements: " + sum);
    }
}

Output:

Sum of elements: 60

Explaination of the above Program:

Method calculateSum() calculates the sum of elements in the vector.
The calculateSum() method iterates through the elements of the vector and checks if each element is an instance of Integer. If it is, it adds it to the sum.
In the main method, an instance of GFG with a type of Integer is created.
Three integers are added to this GFG instance using the add() method.
The calculateSum() method is then called to calculate the sum of the integers in the vector.
Finally, the sum is printed to the console.