java do while loop keeps looping after condition is met

Question

I am a new java programmer and I am writing a program that sets 3 model numbers for 3 printers. If user inputs wrong values I want it to continue asking user for the model numbe

Answer 1

import java.util.Scanner;

public class newClass
{

    public static void main(String[] args)
    {
        int count = 0; 
        String machine1 = "546";
        String machine2 = "892";
        String machine3 = "127";

        Scanner s = new Scanner(System.in);

        while (true)
        {
            System.out.print("Model Number:");
            String modelNumber = s.nextLine();
            // increment count if first input value is wrong
            if ((!modelNumber.equals(machine1)) || (!modelNumber.equals(machine2)) || (!modelNumber.equals(machine3)))
                count++;

            if (count == 3)
            {
                System.out.println("You have utilized your maximum number of try's");
                break;
            }

            if (modelNumber.equals(machine1))
            {
                System.out.println("Machine 1 is online");
                break;
            }
            if (modelNumber.equals(machine2))
            {
                System.out.println("Machine 2 is online");
                break;
            }
            if (modelNumber.equals(machine3))
            {
                System.out.println("Machine 3 is online");
                break;
            }

            System.out.println("Try again");

        }
    }
}

Hope this solves your question