9) Switch

import java.util.Scanner;
public class Main {


    public static void main(String[]args){

        Scanner input = new Scanner(System.in);

        System.out.println("Please enter a command: ");
        String text = input.nextLine();

        switch(text){
            case "start":
                System.out.println("Machine started");
                break;

            case "stop":
                System.out.println("Machine stopped");
                break;

            default:
                System.out.println("Command not recognised:");

        }
    }
}