BlackJackFinal.java

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

public class BlackJackFinal {
	private static Scanner in;
	private static boolean again;

	public static void main(String[] args) throws InterruptedException {
		Random r = new Random();
		in = new Scanner(System.in);
		
		System.out.print("Welcome to Aaron's Blackjack program v.4\n\n");
		
		int count=0; //used to continue game if user or dealer gets a blackjack
		
		do { //runs entire loop at least once
			int[] card = new int[4]; //sets initial four card values
			for (int i=0; i<card.length;i++) {
				card[i]=2+r.nextInt(10);
			}
			
			int sum_player = card[0]+card[1]; //gets initial sum for player
			int sum_dealer = card[2]+card[3]; //gets initial sum for dealer
		
			if (card[0]==11&&card[1]==11) { //if players first 2 cards are 11 randomly sets one of the cards to a 1 and sum to 12
				int alternate = r.nextInt(2);  
				card[alternate]=1;
				sum_player=12;
			}
			if (card[2]==11&&card[3]==11) { //if dealers first 2 cards are 11 randomly sets one of the cards to a 1 and sum to 12
				card[3]=1;
				sum_dealer=12;
			}
			Thread.sleep(900);
		
			System.out.println("You were dealt a "+card[0]+" and a "+card[1]+"!"); //shows players cards and sum
			System.out.println("Your total is "+sum_player+"!\n");	
			Thread.sleep(900);
		
			System.out.println("Dealer has a "+card[2]+" showing and a hidden card."); //shows one of dealers card
			Thread.sleep(900);
		
			if (card[2]==11&&sum_dealer==21&&sum_player!=21) { //if initial dealer total = 21 and player sum isn't 21, dealer wins
				System.out.println("\nDealer reveals his hidden card and it is a "+card[3]+".");			
				System.out.println("Dealer's total is "+sum_dealer+".");
				System.out.println("Dealer wins with a Blackjack!");
				count++; //adds to count so game will work properly
				PlayAgain(); //runs the PlayAgain function
			}
			
			else if (card[2]==11&&sum_dealer==21&&sum_player==21) { //tie game if both player and dealer initially get a 21
				System.out.println("\nDealer reveals his hidden card and it is a "+card[3]+".");			
				System.out.println("Dealer's total is "+sum_dealer+".");
				System.out.println("Both players have a BlackJack! Push!");
				count++;
				PlayAgain();
			}
		
			while (sum_player < 21 &&sum_dealer != 21) { //if neither have 21 gives option to hit or stay
				System.out.println("\nWould you like to 'hit' or 'stay'?");
				String hit_stay = in.nextLine();
			
				if (hit_stay.equals("hit")) { //if you hit, adds new value to your sum 
					int a = 2 + r.nextInt(10);
					sum_player = sum_player + a;
					System.out.println("You drew a "+a+".");
					System.out.println("Your total is "+sum_player+".");
				}
				else if (hit_stay.equals("stay")) { //breaks while loop if you choose stay
					break;
				}
				else { //forces you to enter hit or stay
					System.out.println("Please enter in a valid answer.");
				}
			}
		//below shows so of the following win scenarios
			if (sum_player > 21) {
				System.out.println("\nBUST! Dealer wins.");
				PlayAgain();
			}
		
			else if (sum_player==21&&sum_dealer!=21) {
				System.out.println("\nWow! A 21?!? You win!");
				PlayAgain();
			}
		
			if (sum_dealer != 21 && sum_player<21) {
				System.out.println("\nDealer reveals his hidden card and it is a "+card[3]+".");			
				System.out.println("Dealer's total is "+sum_dealer+".");
			}

			while (sum_player < 21 && sum_dealer <17 ) {	
				Thread.sleep(900);
				
				int b = 2 + r.nextInt(10);
				System.out.println("\nDealer hits and drew a "+b+".");
				sum_dealer = sum_dealer + b;
				System.out.println("Dealer's total is "+sum_dealer+".");
				Thread.sleep(900);
			}
								
			if (sum_dealer > 21) {
				System.out.println("\nDealer busts, you win!.");
				PlayAgain();
			}
								
			else if (sum_dealer == 21 && count == 0) {
				System.out.println("\nDealer has a 21! Hah never bet against the house!");
				count=0;
				PlayAgain();
			} 	
		
			if (sum_dealer >= 17 && sum_dealer < 21 && sum_player<21) {
				System.out.println("\nDealer stays.");
				Thread.sleep(900);
			}					
							
			while (sum_dealer < 21 && sum_player < 21) {
				if (sum_player > sum_dealer) {
					System.out.println("\nYou win!");
					PlayAgain();
					break;
				}
		
				else if (sum_player < sum_dealer && sum_dealer != 21) {
					System.out.println("\nSorry but the house always wins!");
					PlayAgain();
					break;
				}

				else {
					System.out.println("\nHouse wins all ties!");
					PlayAgain();
					break;
				}
			}
		} while(again==true); //loops until you choose not to play again
		
		System.out.println("Thanks for playing! :)");
	}
	
	public static boolean PlayAgain() { //gives option to play again and rerun do-while loop
		System.out.println("\nPlay again? y/n");
		String play = in.nextLine();
		switch(play){
			case "y": again = true;
			break;
			case "n": again = false;
			break;
			default: System.out.println("Invalid answer. Please answer only (y/n)");
			PlayAgain();
		}
		System.out.println();
		return again;
	}
}