Stack removeElementAt() method in Java with Example

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

Syntax:

Stack.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 Stack.

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

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

Example 1:

// Java code to illustrate removeElementAt()

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

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

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

        // Print the final Stack
        System.out.println("Final Stack: " + stack);

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

Output:

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

Example 2:

// Java code to illustrate removeElement() when position of
// element is passed as parameter

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

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

        // Remove the element at 1st position
        stack.removeElementAt(0);

        // Print the final Stack
        System.out.println("Final Stack: " + stack);

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

Output:

Stack: [10, 20, 30, 40, 50]
The initial size is: 5
Final Stack: [20, 30, 40, 50]
The final size is: 4