Vector insertElementAt() Method in Java

The java.util.vector.insertElementAt(element, index) method is used to insert a particular element at the specified index of the Vector. Both the element and the position is passed as the parameters. If an element is inserted at a specified index, then all the elements are pushed upward by one and hence the capacity is increased, creating a space for the new element.

Syntax:

Vector.insertElementAt()

Parameters: The method accepts two parameters:

element: This is element required to be inserted into the vector.
index: This is of integer type and refers to the position where the new element is to be inserted.

Return Value: The method does not return anything.

Exception: The method throws ArrayIndexOutOfBoundsException if the index is an invalid number.

Below programs illustrate the Java.util.Vector.insertElementAt() method:

Program 1: Adding String elements into the Vector.

// Java code to illustrate insertElementAt() 
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 into the Vector 
        vec_tor.add("Welcome"); 
        vec_tor.add("To"); 
        vec_tor.add("Geeks"); 
        vec_tor.add("4"); 
        vec_tor.add("Geeks"); 
  
        // Displaying the Vector 
        System.out.println("Vector: " + vec_tor); 
  
        // Inseting element at 3rd position 
        vec_tor.insertElementAt("Hello", 2); 
  
        // Inseting element at last position 
        vec_tor.insertElementAt("World", 6); 
  
        // Displaying the final Vector 
        System.out.println("The final vector is " + vec_tor); 
    } 
} 

Output:

Vector: [Welcome, To, Geeks, 4, Geeks]
The final vector is [Welcome, To, Hello, Geeks, 4, Geeks, World]

Program 2: Adding Integer elements into the Vector.

// Java code to illustrate insertElementAt() 
import java.util.*; 
  
public class VectorDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty Vector 
        Vector<Integer> vec_tor = new Vector<Integer>(); 
  
        // Use add() method to add elements into the Vector 
        vec_tor.add(10); 
        vec_tor.add(20); 
        vec_tor.add(30); 
        vec_tor.add(40); 
        vec_tor.add(50); 
  
        // Displaying the Vector 
        System.out.println("Vector: " + vec_tor); 
  
        // Inseting element at 1st position 
        vec_tor.insertElementAt(100, 0); 
  
        // Inseting element at fifth position 
        vec_tor.insertElementAt(200, 4); 
  
        // Displaying the final Vector 
        System.out.println("The final vector is " + vec_tor); 
    } 
} 

Output:

Vector: [10, 20, 30, 40, 50]
The final vector is [100, 10, 20, 30, 200, 40, 50]

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