Stack firstElement() method in Java with Example
The Java.util.Stack.firstElement() method in Java is used to retrieve or fetch the first element of the Stack. It returns the element present at the 0th index of the Stack
Syntax:
Stack.firstElement()
Parameters: The method does not take any parameter.
Return Value: The method returns the first element present in the Stack.
Below programs illustrate the Java.util.Stack.firstElement() method:
Program 1:
// Java code to illustrate firstElement()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); // Displaying the first element System.out.println("The first element is: " + stack.firstElement()); }} |
Output:
Stack: [Welcome, To, Geeks, 4, Geeks] The first element is: Welcome
Program 2:
// Java code to illustrate firstElement()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(15); stack.add(30); stack.add(20); stack.add(5); // Displaying the Stack System.out.println("Stack: " + stack); // Displaying the first element System.out.println("The first element is: " + stack.firstElement()); }} |
Output:
Stack: [10, 15, 30, 20, 5] The first element is: 10
