Stack insertElementAt() method in Java with Example Last Updated : 18 Jan, 2022 Comments Improve Suggest changes Like Article Like Report 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. Java // 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); // Inserting element at 3rd position stack.insertElementAt("Hello", 2); // Inserting element at last position stack.insertElementAt("World", 6); // Displaying the final Stack System.out.println("The final Stack is " + stack); } } 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. Java // 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); // Inserting element at 1st position stack.insertElementAt(100, 0); // Inserting element at fifth position stack.insertElementAt(200, 4); // Displaying the final Stack System.out.println("The final Stack is " + stack); } } Output: Stack: [10, 20, 30, 40, 50] The final Stack is [100, 10, 20, 30, 200, 40, 50] Comment More infoAdvertise with us Next Article Stack insertElementAt() method in Java with Example C code_r Follow Improve Article Tags : Java Java-Collections Java - util package Java-Functions Java-Stack +1 More Practice Tags : JavaJava-Collections Similar Reads Stack retainAll() method in Java with Example The retainAll() method of java.util.Stack class is used to retain from this stack all of its elements that are contained in the specified collection. 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