User input to repeat program in Java

Question

I am writing a simple guessing game program where the user will input a number to try and guess a randomly generated number.

If they get the number right I want to

Answer 1

This code can serve your purpose...

import java.util.Random;
import java.util.Scanner;

public class GuessingGame 
{
private Random num = new Random();
private int answer ;
private int guess;
private String playAgain;

public void inputGuess() 
{         
    answer = num.nextInt(11);
    System.out.println("Enter a number between 1 and 10 as your first guess: ");
    Scanner input = new Scanner(System.in);
    guess = input.nextInt();
    do {            
        if (guess < 1 || guess > 10) {
            System.out
                    .println("That is not a valid entry. Please try again: ");
            guess = input.nextInt();
        } else if (guess > answer) {
            System.out.println("Too high, Try Again: ");
            guess = input.nextInt();
        } else if (guess < answer) {
            System.out.println("Too low, Try Again: ");
            guess = input.nextInt();
        }

    } while (guess != answer);

    System.out.println("Congratulations, You guessed the number!");
    System.out.println("Would you like to play again? Enter Y to play or any other key to quit: ");
    do
    {           
        playAgain = input.nextLine();

    }while(playAgain.length()<1);

    if (playAgain.trim().equalsIgnoreCase("y"))
    {
        inputGuess();           
    }
    else
    {
        System.out.println("Good Bye!!!");
    }

}

public static void main(String[] args) {
    new GuessingGame().inputGuess();
}
   }

Answer 2

Some of the solution I see above aren't correct. The random number, you need to add 1 to get between 1 and 10, also you need to compare with equals. I use case insensitive here.

The following code works as you need it.

import java.util.Random;
import java.util.Scanner;

public class Test2 {
    private static Random num = new Random();
    private static int answer = 0;
    private static int guess;
    private static String playAgain;

    public static void main(String[] args) {
        inputGuess();
    }

    // Guess Method.
    public static void inputGuess(){
        // create answer.
        answer = 1+ num.nextInt(10);

        System.out.println("Enter a number between 1 and 10 as your first guess: ");
        Scanner input = new Scanner(System.in);
        guess = input.nextInt(); 
        do{
        if (guess < 1 || guess > 10){
            System.out.println("That is not a valid entry. Please try again: ");
            guess = input.nextInt();
        }else if (guess > answer){
            System.out.println("Too high, Try Again: ");
            guess = input.nextInt();
        }else if (guess < answer){
            System.out.println("Too low, Try Again: ");
            guess = input.nextInt();
        }

        }while (guess != answer);

        System.out.println("Congratulations, You guessed the number!");
        System.out.println("Would you like to play again? Enter Y to play or any other key to quit: ");
        playAgain = input.nextLine();
        if( playAgain.equalsIgnoreCase("Y") ){ 
            inputGuess();
        }

    }
}