Main.java

import java.util.Random;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Random random = new Random();

        while (true) {

            System.out.println("\nEnter your choice:");
            System.out.println("1 - Generate PIN");
            System.out.println("2 - Exit");
            System.out.print("Your choice: ");

            String choice = scanner.nextLine();

            if (choice.equals("1")) {
                int pin = 1000 + random.nextInt(9000);
                System.out.println("Generated PIN: " + pin);
            }
            else if (choice.equals("2")) {
                System.out.println("Exit...");
                break;
            }
            else {
                System.out.println("Неверный выбор. Пожалуйста, введите 1 или 2.");
            }
        }

        scanner.close();
    }
}