Stack insertElementAt() method in Java with Example

The Java.util.Stack.insertElementAt(element, index) method is used to insert a particular element at the specified index of the Stack. 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:

Stack.insertElementAt()

Parameters: The method accepts two parameters:

  • element: This is element required to be inserted into the Stack.
  • 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.Stack.insertElementAt() method:

Program 1: Adding String elements into the Stack.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to illustrate insertElementAt()
import java.util.*;
  
public class StackDemo {
    public static void main(String args[])
    {
        // Creating an empty Stack
        Stack<String> stack = new Stack<String>();
  
        // Use add() method to add elements into the Stack
        stack.add("Welcome");
        stack.add("To");
        stack.add("Geeks");
        stack.add("4");
        stack.add("Geeks");
  
        // Displaying the Stack
        System.out.println("Stack: " + stack);
  
        // Inseting element at 3rd position
        stack.insertElementAt("Hello", 2);
  
        // Inseting element at last position
        stack.insertElementAt("World", 6);
  
        // Displaying the final Stack
        System.out.println("The final Stack is "
                           + stack);
    }
}

chevron_right






                        filter_none









Output:


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





Program 2: Adding Integer elements into the Stack.











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// Java code to illustrate insertElementAt() 


import java.util.*; 


  


public class StackDemo { 


    public static void main(String args[]) 


    { 


        // Creating an empty Stack 


        Stack<Integer> stack = new Stack<Integer>(); 


  


        // Use add() method to add elements into the Stack 


        stack.add(10); 


        stack.add(20); 


        stack.add(30); 


        stack.add(40); 


        stack.add(50); 


  


        // Displaying the Stack 


        System.out.println("Stack: " + stack); 


  


        // Inseting element at 1st position 


        stack.insertElementAt(100, 0); 


  


        // Inseting element at fifth position 


        stack.insertElementAt(200, 4); 


  


        // Displaying the final Stack 


        System.out.println("The final Stack is "


                           + stack); 


    } 


} 



















                        chevron_right







                        filter_none









Output:


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






          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
Image
GeekCode1
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.