Vector removeElementAt() Method in Java

The java.util.vector.removeElementAt(int index) method is used to remove an element from a Vector from a specific position or index. In this process the size of the vector is automatically reduced by one and all other elements after the removed element are shifted downwards by one position. 

Syntax:

Vector.removeElementAt(int index)

Parameters: This method accepts a mandatory parameter index of integer data type which specifies the position of the element to be removed from the Vector. 

Return Value: This method has void return type. It means it does not return anything. 

Below program illustrate the Java.util.Vector.remove(int index) method: 

Java

// Java code to illustrate removeElementAt()
import java.util.*;

public class VectorDemo {
    public static void main(String args[])
    {

        // Creating an empty Vector
        Vector<String> vec_tor = new Vector<String>();

        // Use add() method to add elements in the Vector
        vec_tor.add("Geeks");
        vec_tor.add("for");
        vec_tor.add("Geeks");
        vec_tor.add("10");
        vec_tor.add("20");

        // Output the Vector
        System.out.println("Vector: " + vec_tor);

        // Initial size
        System.out.println("The initial size is: " + vec_tor.size());

        // Remove the element at 3rd position
        vec_tor.removeElementAt(2);

        // Print the final Vector
        System.out.println("Final Vector: " + vec_tor);

        // Final size
        System.out.println("The final size is: " + vec_tor.size());
    }
}

Output:

Vector: [Geeks, for, Geeks, 10, 20]
The initial size is: 5
Final Vector: [Geeks, for, 10, 20]
The final size is: 4

Time complexity: O(n). // n is the size of the vector.
Auxiliary Space: O(1).

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