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 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); } } |
The Stack is: [Geeks, for, Geeks, 10, 20] The new Stack is: [Geeks, for, Last, Geeks, Element, 10, 20]
Example 2:
// 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); } } |
The Stack is: [10, 20, 30, 40, 50] The new Stack is: [100, 10, 20, 200, 30, 40, 50]
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