/* This code works perfectly on IDEs. Warning! You must have JDK 1.8 or higher. Input: 'Y' to take card, 'N' to not. Bugs: NoSuchElementException. SoloLearn compiler doesn't take multiple inputs. */ import java.util.ArrayList; import java.util.Collections; import java.util.Random; import java.util.Scanner; public class Blackjack { private static int playedGames = 0; private static int wonGames = 0; private static int draws = 0; public static void main(String[] args) { Scanner sc = new Scanner(System.in); while(true) { startGame(); System.out.println("Do you want to play again? (Y/N)"); String decision = sc.nextLine().toUpperCase(); if(decision.equals("Y")) { continue; } else { break; } } sc.close(); endGame(); } private static void startGame() { ArrayList cards = new ArrayList<>(); ArrayList user = new ArrayList<>(); ArrayList ai = new ArrayList<>(); for(int i = 0; i < 4; i++) { for(int j = 2; j < 12; j++) { cards.add(j); } } Collections.shuffle(cards, new Random()); user.add(cards.get(cards.size() - 1)); cards.remove(cards.size() - 1); ai.add(cards.get(cards.size() - 1)); cards.remove(cards.size() - 1); user.add(cards.get(cards.size() - 1)); cards.remove(cards.size() - 1); ai.add(cards.get(cards.size() - 1)); cards.remove(cards.size() - 1); boolean didUserTake = true; boolean didAITake = true; while(true) { if(didUserTake) { didUserTake = getUserInput(user); } if(didAITake) { didAITake = getAIInput(ai); } if(didUserTake) { user.add(cards.get(cards.size() - 1)); cards.remove(cards.size() - 1); } if(didAITake) { ai.add(cards.get(cards.size() - 1)); cards.remove(cards.size() - 1); } if(!didUserTake && !didAITake) { compareCards(user, ai); break; } } } private static boolean getUserInput(ArrayList user) { int sum = user.stream().mapToInt(Integer::intValue).sum(); System.out.println("Your cards: " + user + ". Sum = " + sum); Scanner sc = new Scanner(System.in); System.out.println("Do you want to take a card? (Y/N)"); while(true) { String decision = sc.nextLine().toUpperCase(); if(decision.equals("Y")) { return true; } else if(decision.equals("N")) { return false; } else { System.out.println("Wrong input! Do you want to take a card? (Y/N)"); } } } private static boolean getAIInput(ArrayList ai) { int sum = ai.stream().mapToInt(Integer::intValue).sum(); if((21 - sum) > 4) { return true; } else { return false; } } private static void compareCards(ArrayList user, ArrayList ai) { playedGames++; int userSum = user.stream().mapToInt(Integer::intValue).sum(); int aiSum = ai.stream().mapToInt(Integer::intValue).sum(); System.out.println("Your cards: " + user + ". Sum = " + userSum); System.out.println("Computer cards: " + ai + ". Sum = " + aiSum); if(userSum == 22 && user.size() == 2) { userSum--; } if(aiSum == 22 && ai.size() == 2) { aiSum--; } if(userSum == aiSum || (userSum > 21 && aiSum > 21)) { System.out.println("Draw!"); draws++; } else if((userSum > aiSum && (userSum <= 21 && aiSum <= 21)) || (userSum <= 21 && aiSum > 21)) { System.out.println("You won!"); wonGames++; } else { System.out.println("You lost!"); } } private static void endGame() { System.out.println("Played games: " + playedGames); System.out.println("Won games: " + wonGames); System.out.println("Lost games: " + (playedGames - wonGames - draws)); System.out.println("Draws: " + draws); } }

Blackjack with AI