SlotMachineProgram.java

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

public class SlotMachineProgram {

    // Array of symbols
    static String[] slotSymbols = {"🍋", "🤑", "⭐️", "🍉", "🍒"};
    static String[] slotRow = new String[3];
    static double balance = 100;
    static double userBet;

    public static void main(String[] args) {

        // JAVA SLOT MACHINE PROGRAM

        // Declare variables
        Scanner scanner = new Scanner(System.in);
        boolean continuePlaying = true;
        char response;
        double payout;

        // Welcome menu - show symbols + show current balance
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println(" $ Welcome to JAVA SLOTS - Test Your Luck! $");
        System.out.println("+++++++++++++++++++++++++++++++++++++++++++++");
        System.out.print("Symbols: ");
        for (String slotSymbol : slotSymbols) {
            System.out.print(slotSymbol + " "); // Displaying the symbols
        }
        System.out.println();

        while (continuePlaying) {
            // Shows current balance of user - make sure player is prompted for valid input
            placeBets(scanner);

            // Slot machine mechanics:
            System.out.println("Spinning...");
            System.out.println("****************");
            spinSlotMachine(); // Randomly spins for three symbols
            System.out.println("****************");

            // Check to see for matching symbols and see what player wins
            payout = getPayout(slotRow, userBet); // getPayout method checks for matching symbols
            balance = balance + payout; // Update the balance

            // Output if user won or lost
            if (payout > 0) {
                System.out.println("You won: $" + payout);
            }
            else {
                System.out.println("Sorry you lost this round");
            }

            // Play again?
            do {
                System.out.print("Do you like to spin again? (y/n): ");
                response = scanner.nextLine().toLowerCase().charAt(0);

                if (response != 'y' && response != 'n') {
                    System.out.println("INVALID ANSWER! Please enter 'y' for YES or 'n' for NO");
                }
            } while (response != 'y' && response != 'n');

            continuePlaying = (response == 'y');
            if (!continuePlaying) {
                System.out.println("GAME OVER! Your final balance is $" + balance);
            }
        }

        scanner.close();
    }
    static void placeBets(Scanner scanner) {
        do {
            System.out.printf("Current Balance: $%.2f\n", balance);

            // Bets - if user loses, they lose that money, if they win, they gain that money
            System.out.print("Place your bets ($): ");
            userBet = scanner.nextDouble();
            scanner.nextLine(); // Clear buffer

            // Verify your bet (needs to be less than or equal to balance but greater than 0)
            if (userBet > balance) {
                System.out.println("INSUFFICIENT FUNDS! You don't have that much money.");
            }
            else if (userBet <= 0) {
                System.out.println("INVALID NUMBER! Bets must be greater than 0.");
            }
        } while (userBet > balance || userBet <= 0);

        // If bet is made, make sure to subtract it from balance
        balance -= userBet;
    }
    static void spinSlotMachine() {

        // Declare variables
        Random random = new Random();
        int symbolIndex;

        for (int i = 0; i < 3; i++) {
            symbolIndex = random.nextInt(5);
            slotRow[i] = slotSymbols[symbolIndex];
        }
        // Output the 3 randomly chosen symbols
        System.out.println("  " + String.join(" | ", slotRow));

    }
    static double getPayout(String[] slotRow, double userBet) {
        // If all three symbols match
        if (slotRow[0].equals(slotRow[1]) && slotRow[1].equals(slotRow[2])) {
            return switch(slotRow[0]) {
                case "🍒" -> userBet * 3;
                case "🍉" -> userBet * 4;
                case "🍋" -> userBet * 5;
                case "🤑" -> userBet * 10;
                case "⭐️" -> userBet * 20;
                default -> 0;
            };
        } // If first two symbols match
        else if (slotRow[0].equals(slotRow[1])) {
            return switch (slotRow[0]) {
                case "🍒" -> userBet * 2;
                case "🍉" -> userBet * 3;
                case "🍋" -> userBet * 4;
                case "🤑" -> userBet * 5;
                case "⭐️" -> userBet * 10;
                default -> 0;
            };
        } // If last two symbols match
        else if (slotRow[1].equals(slotRow[2])) {
            return switch (slotRow[1]) {
                case "🍒" -> userBet * 2;
                case "🍉" -> userBet * 3;
                case "🍋" -> userBet * 4;
                case "🤑" -> userBet * 5;
                case "⭐️" -> userBet * 10;
                default -> 0;
            };
        }

        return 0;
    }
    // This is a prototype method I tried to do
    //    static void SlotMachine() {
//
//        for (int i = 0; i < 3; i++) {
//            slotIndex = random.nextInt(5);
//            String slotSymbol = slotSymbols[slotIndex];
//            if (i == 2) {
//                System.out.print(slotSymbol);
//                break;
//            }
//            System.out.print(slotSymbol + " | ");
//        }
//        System.out.println();
//    }
}