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Stack add(int, Object) method in Java with Example

Last Updated : 24 Dec, 2018
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The add(int, Object) method of Stack Class inserts an element at a specified index in the Stack. It shifts the element currently at that position (if any) and any subsequent elements to the right (will change their indices by adding one). Syntax: 
void add(int index, Object element)
Parameters: This method accepts two parameters as described below.
  • index: The index at which the specified element is to be inserted.
  • element: The element which is needed to be inserted.
Return Value: This method does not return any value. Exception: The method throws IndexOutOfBoundsException if the specified index is out of range of the size of the Stack. Below program illustrates the working of java.util.Stack.add(int index, Object element) method: Example: Java 
// Java code to illustrate boolean add(Object element)
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 in the Stack
        stack.add("Geeks");
        stack.add("for");
        stack.add("Geeks");
        stack.add("10");
        stack.add("20");

        // Output the present Stack
        System.out.println("The Stack is: " + stack);

        // Adding new elements
        stack.add(2, "Last");
        stack.add(4, "Element");

        // Printing the new Stack
        System.out.println("The new Stack is: " + stack);
    }
}
Output: 
The Stack is: [Geeks, for, Geeks, 10, 20]
The new Stack is: [Geeks, for, Last, Geeks, Element, 10, 20]
Example 2: Java 
// Java code to illustrate
// boolean add(Object element)

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 in the Stack
        stack.add(10);
        stack.add(20);
        stack.add(30);
        stack.add(40);
        stack.add(50);

        // Output the present Stack
        System.out.println("The Stack is: "
                           + stack);

        // Adding new elements
        stack.add(0, 100);
        stack.add(3, 200);

        // Printing the new Stack
        System.out.println("The new Stack is: "
                           + stack);
    }
}
Output: 
The Stack is: [10, 20, 30, 40, 50]
The new Stack is: [100, 10, 20, 200, 30, 40, 50]

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