Thread: Do while loop problem

Hi all,
My program is pretty simple, it involves a guessing game where the user is prompted to enter an amount of money to start with. After that the user guesses a number from 1 to 100 and depending on the number guessed, the game lets you know if it's too high or low. With that said, I am trying to insert a loop to prompt an error if the user enters an amount that's over $300 and allow the user to re-enter an amount. If the amount initially or after the error is <= to 300, then the user may proceed with the game. This is the code before the do/while loop is implemented:

import java.io.IOException;
import java.util.Random;
import java.util.Scanner;
 
public class guessinggame2 {
       public static void main(String[] args) throws IOException {
               Scanner reader = new Scanner(System.in);
               Random random = new Random();
 
               int randomNumber,
               dollars = 0,
               balance = dollars,
               guessedNumber = 0;
               char runAgain = 'y';
 
               randomNumber = random.nextInt(101);
               		System.out.print("Welcome to the Guessing Game!" + "\n" );
                       System.out.print("The rules are simple, you have to guess the correct number and   " + "\n");
                       System.out.print("if it is wrong, you lose $10 and will be prompted on how close   " + "\n");
                       System.out.print("to the number you are. If you guess the number right, you win " + "\n");
                       System.out.print("$100 and can choose whether or not to continue playing or not." + "\n");
                       System.out.print("" + "\n");
                       System.out.print("How many dollars do you wish to start off with? (Maximum of $300) " + "\n");
                       dollars =reader.nextInt();
               while (runAgain == 'y' || runAgain == 'Y')
               {                      
                       System.out.print("Please pick a number between 1 and 100: ");
                       guessedNumber = reader.nextInt();
                       while (guessedNumber != randomNumber)
                       {  
                        if (guessedNumber < randomNumber)
                        {
                                               dollars -= 10;
                                               System.out.println("Too low!\nGuess again!\nYour balance is: $" + dollars + "\n");
                        }
 
                                       if (guessedNumber > randomNumber)
                                       {
                                               dollars -= 10;
                                               System.out.println("Too high\nGuess again!\nYour balance is: $" + dollars + "\n");
                                       }        
 
                               System.out.print("Please pick a number between 1 and 100: ");
                               guessedNumber = reader.nextInt();      
                       }
                       dollars += 50;
                       System.out.println("Congratulations, you got it!" +"\n");
                       System.out.println("Your balance is: $" + dollars + "\n");
                       System.out.print("Play again (y/n)? ");
                       runAgain = (char)System.in.read();
 
                       if (runAgain == 'n' || runAgain == 'N')
 
                       {
                               System.exit(0);
                       }
                        if (runAgain == 'y' || runAgain == 'Y')
                    		   randomNumber = random.nextInt(101);
               }
       }
}

And this is the code with the attempted do/while loop, which doesn't work:

import java.io.IOException;
import java.util.Random;
import java.util.Scanner;
 
public class guessinggame2 {
       public static void main(String[] args) throws IOException {
               Scanner reader = new Scanner(System.in);
               Random random = new Random();
 
               int randomNumber,
               dollars = 0,
 
               guessedNumber = 0;
               char runAgain = 'y';
 
               randomNumber = random.nextInt(101);
               		System.out.print("Welcome to the Guessing Game!" + "\n" );
                       System.out.print("The rules are simple, you have to guess the correct number and   " + "\n");
                       System.out.print("if it is wrong, you lose $10 and will be prompted on how close   " + "\n");
                       System.out.print("to the number you are. If you guess the number right, you win " + "\n");
                       System.out.print("$100 and can choose whether or not to continue playing or not." + "\n");
                       System.out.print("" + "\n");
                       System.out.print("How many dollars do you wish to start off with? (Maximum of $300) " + "\n");
                       dollars =reader.nextInt();
 
                       do{
 
                    	   System.out.println("Error, please enter a valid amount: ");
                    	   dollars =reader.nextInt();
                    	   while (dollars >= 301);
 
 
               while (runAgain == 'y' || runAgain == 'Y')
               {                      
                       System.out.print("Please pick a number between 1 and 100: ");
                       guessedNumber = reader.nextInt();
                       while (guessedNumber != randomNumber)
                       {  
                        if (guessedNumber < randomNumber)
                        {
                                               dollars -= 10;
                                               System.out.println("Too low!\nGuess again!\nYour balance is: $" + dollars + "\n");
                        }
 
                                       if (guessedNumber > randomNumber)
                                       {
                                               dollars -= 10;
                                               System.out.println("Too high\nGuess again!\nYour balance is: $" + dollars + "\n");
                                       }        
 
                               System.out.print("Please pick a number between 1 and 100: ");
                               guessedNumber = reader.nextInt();      
                       }
                       dollars += 50;
                       System.out.println("Congratulations, you got it!" +"\n");
                       System.out.println("Your balance is: $" + dollars + "\n");
                       System.out.print("Play again (y/n)? ");
                       runAgain = (char)System.in.read();
 
                       if (runAgain == 'n' || runAgain == 'N')
 
                       {
                               System.exit(0);
                       }
                        if (runAgain == 'y' || runAgain == 'Y')
                    		   randomNumber = random.nextInt(101);
               }
       }
}
}

Any help/suggestions are greatly appreciated.
Thank you.