Thread: Why is my do/while loop for play again not working?

I am brand new to java. Can someone tell me why my do/while loop for playing again is not working?

import java.util.Scanner;
 
public class Lavoie_4_17 {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
 
		// Declaring and initializing variables.
		int target_number, user_guess;
		String play_again = "";
 
		// Creating scanner for user input.
		Scanner keyboard = new Scanner(System.in);
 
		// Do/while loop creating a random number in the range of 1-10 then checking if user wants to play again.
		do {
			target_number =  (int)(Math.random()*10 + 1);
 
			// Do/while loop asking for the user's guess then checking if user's guess is equal to the random number.
			do {
				System.out.println("Enter your guess (1-10) in integer form: ");
				user_guess = keyboard.nextInt();
 
				// If/else statement comparing user_guess to target number then displaying to the screen whether the guess was
				// too high, too low, or equal to the target number. If the guess was correct, the user is asked if they would like 
				// to play again.
				if (user_guess > target_number) {
					System.out.println("Too high, try again. ");
				}
				else if (user_guess < target_number) {
					System.out.println("Too low, try again. ");
				}
				else {
					System.out.println("You guessed right!! You won the chance to play again.\nWould you like to play again? (Y/N): ");
					play_again = keyboard.nextLine();
				}
 
			}
 
			while (target_number != user_guess);
		}
 
		while (play_again.equalsIgnoreCase("Y"));
 
		// Closing keyboard scanner.
		keyboard.close();
	}
 
}

--- Update ---

So I added a second scanner and used it for .nextline() input and it now works. Is there a way to clear the scanner so when I create larger programs I don't have to create a ton of scanners for multiple input types?

import java.util.Scanner;
 
public class Lavoie_4_17 {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
 
		// Declaring and initializing variables.
		int target_number, user_guess;
		String play_again = "";
 
		// Creating scanners for user inputs.
		Scanner keyboard = new Scanner(System.in);
		Scanner keyboard_again = new Scanner(System.in);
 
		// Do/while loop creating a random number in the range of 1-10 then checking if user wants to play again.
		do {
			target_number =  (int)(Math.random()*10 + 1);
 
			// Do/while loop asking for the user's guess then checking if user's guess is equal to the random number.
			do {
				System.out.println("Enter your guess (1-10) in integer form: ");
				user_guess = keyboard.nextInt();
 
				// If/else statement comparing user_guess to target number then displaying to the screen whether the guess was
				// too high, too low, or equal to the target number. If the guess was correct, the user is asked if they would like 
				// to play again.
				if (user_guess > target_number) {
					System.out.println("Too high, try again. ");
				}
				else if (user_guess < target_number) {
					System.out.println("Too low, try again. ");
				}
				else {
					System.out.println("You guessed right!! You won the chance to play again.\nWould you like to play again? (Y/N): ");
					play_again = keyboard_again.nextLine();
				}
 
			}
 
			while (target_number != user_guess);
		}
 
		while (play_again.equalsIgnoreCase("Y"));
 
		// Closing keyboard scanners.
		keyboard.close();
		keyboard_again.close();
	}
 
}