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Stack firstElement() method in Java with Example

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  • Last Updated : 24 Dec, 2018
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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

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