Help me solve the "ANSWER" problem.

Question

Hello, im new here, and im a new java student.
i've written a program. however, the program asks the user a question, the user needs to answer either 1 or 2. i need the program to ask the question as long as the user doesnt enter 1 or 2. so if the user enters "2365" or "addasda" it will ask the question again.
this is the main class:
import java.util.Random;
public class Game
     private String name;
     private String answer;
     private int numMarbles;
     private int marblesTaken;
     private int pcMarblesTaken;
     int exit;
     int exit2;
     public Game(String name)
          this.name = name;
     public String getName()
          return name;
     public boolean goodInput()
          //do
          //     if(exit==1)
          //          return true;
               if(exit2 == 1 || exit2==2)
                    return true;
                    return false;
          //while(!goodInput());
}This is the test class:
import java.util.Random;
import java.util.Scanner;
public class GameTester
     public static void main (String [] args)
          Scanner input = new Scanner(System.in);
          int exit;
          do
               System.out.print("what is your name: ");
               String name = input.next();
               Game howdy = new Game(name);          
               int exit2;
               do
                    System.out.println("Hello " + howdy.getName() + " Do you want to go first? (1)Yes, (2)No");
                    exit2 = input.nextInt();
               while(howdy.goodInput());
               System.out.println("You must enter either 1 for Yes or 2 for No");
                    if(exit2==1)
                         Random random = new Random();
                         int min = 10;
                         int max = 100;
                         int diff = max - min + 1;
                         int numMarbles = random.nextInt(diff) + min;
                         System.out.println("the number of marbles is: " + numMarbles);
                         while(numMarbles > 1)
                              System.out.print("How many marbles you want to remove? ");
                              int marblesTaken = input.nextInt();
                              numMarbles = numMarbles - marblesTaken;
                              System.out.println("the number of marbles left is " + numMarbles);
                              System.out.println("It is now the computer's turn");
                              int pcMarblesTaken = random.nextInt(numMarbles/2)+1;
                              System.out.println("the computer has taken " + pcMarblesTaken + " marbles");
                              numMarbles = numMarbles - pcMarblesTaken;
                              System.out.println("the number of marbles left is: " + numMarbles);
                              if (numMarbles==1)
                                   System.out.println(howdy.getName()+ " You lose");
                                   break;
                              System.out.println("It is now your turn");               
                    else
                         Random random = new Random();
                         int min = 10;
                         int max = 100;
                         int diff = max - min + 1;
                         int numMarbles = random.nextInt(diff) + min;
                         System.out.println("the number of marbles is: " + numMarbles);
                         while(numMarbles > 1)
                              int pcMarblesTaken = random.nextInt(numMarbles/2)+1;
                              System.out.println("the computer has taken " + pcMarblesTaken + " marbles");
                              numMarbles = numMarbles - pcMarblesTaken;
                              System.out.println("the number of marbles left is: " + numMarbles);
                              System.out.println("It is now your turn");
                              System.out.print("How many marbles you want to remove? ");
                              int marblesTaken = input.nextInt();
                              numMarbles = numMarbles - marblesTaken;
                              System.out.println("the number of marbles left is " + numMarbles);
                              if (numMarbles==1)
                                   System.out.println(howdy.getName()+" You Win!!");
                                   break;
                              System.out.println("It is now the computer's turn");
          System.out.print("Do you want to play again? (1)Yes, (2)No ");
          exit = input.nextInt();          
          while(exit==1);
          System.out.println("Thanks for playing with us!");               
}     

Answer 1

The question is.
How do i make the program ask the question
System.out.println("Hello " + howdy.getName() + " Do you want to go first? (1)Yes, (2)No");as long as the user enters the correct answer.
so if they enter "adsdds" or "45" it will repeat the question again.