Not able to add multiple elements inside the stack in java collection framework. whenever i print the stack then also the stack is showing the currently added element inside the stack. I am trying to add multiple elements inside the stack so that i can perform all stack related operations.

import java.util.*;

public class stackexp1 {
    public static void main(String[] args) {
        while (true) {
            Stack<Integer> numberss = new Stack<Integer>();
            System.out.println("\n.........Operations on stack ...........");
            System.out.println("1 >> Push >> 1 ");
            System.out.println("2 >> Pop >> 2 ");
            System.out.println("3 >> Display >> 3 \n");
            int choice, num;
            System.out.print("Enter your choice >> ");
            Scanner sdc = new Scanner(System.in);
            choice = sdc.nextInt();
            switch (choice) {
                case 1: {
                    System.out.println("Your  choice was push operation ......:)");
                    System.out.print("\nEnter a number to be pushed >> ");
                    Scanner b = new Scanner(System.in);
                    num = b.nextInt();
                    numberss.push(num);
                    System.out.println(numberss);
                }
                    break;
                case 2: {
                    if (numberss.size() >= 0) {
                        System.out.println("Your choice is pop operation ......:)");
                        System.out.println("The element from the stack >> " + numberss.pop());
                    } else {
                        System.out.println("\nStack is empty");
                    }
                }
                    break;
                case 3: {
                    if (numberss.size() >= 0) {
                        System.out.println("Your choice is display Stack elements .....:)");
                        System.out.println("The elements inside the stack are >> " + numberss);
                    } else {
                        System.out.println("Stack is empty ....:)");
                    }
                }
                    break;
                default: {
                    System.out.println("No such choice is available ....:)");
                }
            }
        }
    }
}

Output .. >>

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>Solution :

That is because you are creating a new stack on each iteration of the while loop.

Move the declaration and initialization of the stack outside the while loop. Also, you don’t need more than one instance of a Scanner. You can move that outside the loop as well.

Stack<Integer> numbers = new Stack<>();
Scanner sdc = new Scanner(System.in);

while (true) {
    // your logic
}