Stack (Java Collections)

import java.util.*;public class Main {    public static void main(String[] args) {        Stack<String> stack = new Stack<>();        stack.push("jack");        stack.push("john");        stack.push("jacob");        System.out.println("Before Pop");        System.out.println(stack);        stack.pop();        System.out.println("After Pop");        System.out.println(stack);

import java.util.*;public class Main {    public static void main(String[] args) {        Stack<String> stack = new Stack<>();        Scanner scanner = new Scanner(System.in);        System.out.println("Enter the Length:");        int number = scanner.nextInt();        scanner.nextLine();        for (int i= 1;i<=number;i++)        {            stack.push(scanner.nextLine());        }        System.out.println("Before Pop");        System.out.println(stack);        System.out.println("Pop Count:");        int popNumber = scanner.nextInt();        scanner.nextLine();        for (int i=1;i<=popNumber; i++)        {            stack.pop();        }        System.out.println(stack);    }}