How do I add a 'Play Again feature' to my Number Guessing Game?

I need some help on being able to add a play again feature. If the user guesses the right value, ask them if they want to play (using Y/N) and reset the random number.

Also, is there any way to modify my code so that the user can first set the parameters of the random number by setting a min. and max. number? Thanks!

Here's what I've got so far:

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

class Random_Number_Game {

  int maxNumber;
  int minNumber;
  int numberToBeGuessed = 0;
  int totalGuessesTaken = 0;

public Random_Number_Game(int min, int max) {
    maxNumber = max;
    minNumber = min;
    int userGuess;

    numberToBeGuessed = createRandomNumber();

    do {
        totalGuessesTaken++;
        userGuess = retrieveUserInput();
       } while (!checkUserInput(userGuess));
} // end GuessMyNumber method


 public int retrieveUserInput() {

    Scanner keyboard = new Scanner(System.in);
    String userinput;

    do {
        System.out.print("Guess a number between 0 and 100: ");
        userinput = keyboard.nextLine();
    } while (!isUserInputValid(userinput));

    return Integer.parseInt(userinput);
} // end retrieveUserInput method



public int createRandomNumber() {
    Random r = new Random();
    return r.nextInt(101);
}

public boolean checkUserInput(int guess) {

    if (guess == numberToBeGuessed) {

        System.out.println("Right! It took you " + totalGuessesTaken + " guesses.");
        return true;

    } else {

        if (guess > numberToBeGuessed) {
            System.out.println("Too High!");
        } else {
            System.out.println("Too Low!");
        }
    }
    return false;
}


public static boolean isUserInputValid(String testerString) {
    try {
        Integer.parseInt(testerString);
    } catch (NumberFormatException e) {
        System.out.println("That input is invalid. You entered '" + testerString + "'. Please enter a proper integer: ");
        return false;
    }
    return true;
}

public static void main(String args[]) {
    new Random_Number_Game(0, 101);
}

}