Guess the Number Game

import java.util.*;

public class GuessNumberGame
{
    public static void main(String[] args)
    {
        System.out.println("Welcome to the Guess the Number Game" + "\n" +
         "++++++++++++++++++++++++++++++++++++");

        Scanner sc = new Scanner(System.in);
        String choice = "y";

        while (choice.equalsIgnoreCase("y"))
        {
            // get the input from the user
            System.out.println("I'm thinking of a number from 1 to 100"
             + "\n" + "Try to guess it." + "\n");
          
            int randomNumber = (int)(Math.random() * 99 + 1);
            int numberOfGuesses = 0;
            // print out the random Number to check the game
// hide this code before turning homework
            System.out.println("The answer from the system is: " + randomNumber);

            // format the result as a single string
            while (true)
{
             int guess = getIntWithinRange(sc,"Please input valid number." + "\n",1,100);
             numberOfGuesses++;

            
if (guess == randomNumber) // use "==" not "="
{
if (numberOfGuesses <=3)
System.out.println("You got it in " + numberOfGuesses + " tries."
+ "\n" + "Great work You are a mathematical wizard." + "\n");
else if ((numberOfGuesses > 3) && (numberOfGuesses <= 7))
System.out.println("You got it in " + numberOfGuesses + " tries."
+ "\n" + "Not too bad! You've got some potential."+ "\n");
else if (numberOfGuesses >7)
System.out.println("You got it in " + numberOfGuesses + " tries."
+ "\n" + "What took you so long? Maybe you should " +
"take some lessons."+ "\n");
break;
}
else
{
if (guess >= (randomNumber + 10))
System.out.println("Way too high! Please guess again." + "\n");
else if (guess > randomNumber)
System.out.println("Too high! Please guess again." + "\n");
else if (guess < randomNumber)
System.out.println("Too low! Please guess again." + "\n");
}
}
            // see if the user wants to continue
            while (true)
{
System.out.print("Try again? (y/n)");
choice = sc.next();
   System.out.println();

   if (choice.equals("y") || choice.equals("n"))
       {
    if (choice.equals("y"))
    System.out.println("The new game starts." + "\n");
   
    else if (choice.equals("n"))
    System.out.println("Bye - Come back soon!");
       break;
       }
   else if ((!choice.equalsIgnoreCase("y")) && (!choice.equalsIgnoreCase("n")))
   {
    if (choice.equals(""))
    {
    System.out.println("Error! This entry is required. Try again");
    }
       else
    {
    System.out.println("Error! Entry must be 'y' or 'n'. Try again.");
    }
}
}
        }
    }
    public static int getIntWithinRange(Scanner sc, String prompt,int min, int max)
    {
     int i;
     while(true)
     {
     System.out.print("Enter Nubmer:");
     i = sc.nextInt();
     if(i<min || i>max)
     {
     System.out.println(prompt);
     }
     else
     break;
     }
     return i;
    }        
}