✨ Java Day 8 – Slot Machine Game 🎰 + Car Class 🚗 + Real OOP Concepts 🛠️

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👋 Hey everyone!

Today was hands-down one of the most fun and productive days in my Java learning journey so far! I tackled three very different programs — each unlocking new concepts and connecting the dots around Object-Oriented Programming (OOP), game logic, and real-world modeling.

Whether you’re just starting or revisiting Java, these examples will feel relatable and insightful. Let me walk you through everything I coded and learned.

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🎰 1. SLOT MACHINE GAME – My First Java Game!

What does it do?

• You start with a balance of ₹100.

• You place bets for each spin.

• Three random symbols (emojis) appear after each spin.

• Matching symbols win money — 3 matches is a jackpot!

• If no matches, you lose the bet amount.

• Game continues until you run out of money or quit.

Why this game?

• It’s a perfect beginner project to practice:

  • Generating random values

  • Handling user input

  • Using loops and conditions

  • Designing simple game logic

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Code:

javaCopyEditimport java.util.*;

public class SlotMachine {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Random rand = new Random();

        String[] symbols = {"🍇", "🍈", "🍉", "🍊", "🍋"};
        int balance = 100;

        System.out.println("🎰 Welcome to JAVA Slot Machine!");
        System.out.println("Symbols: 🍇🍈🍉🍊🍋");

        while (balance > 0) {
            System.out.println("💰 Current Balance: ₹" + balance);
            System.out.print("Place your bet: ");
            int bet = scanner.nextInt();

            if (bet > balance || bet <= 0) {
                System.out.println("❌ Invalid bet amount!");
                continue;  // Prompt user again without losing balance
            }

            String sym1 = symbols[rand.nextInt(symbols.length)];
            String sym2 = symbols[rand.nextInt(symbols.length)];
            String sym3 = symbols[rand.nextInt(symbols.length)];

            System.out.println("Spinning...");
            System.out.println(sym1 + " | " + sym2 + " | " + sym3);

            if (sym1.equals(sym2) && sym2.equals(sym3)) {
                int winnings = bet * 5;
                balance += winnings;
                System.out.println("🎉 Jackpot! You won ₹" + winnings);
            } else if (sym1.equals(sym2) || sym2.equals(sym3)) {
                int winnings = bet * 2;
                balance += winnings;
                System.out.println("😊 Nice! You won ₹" + winnings);
            } else {
                balance -= bet;
                System.out.println("💔 You lost this round.");
            }

            System.out.print("Play again? (yes/no): ");
            String choice = scanner.next();
            if (!choice.equalsIgnoreCase("yes")) {
                break;
            }
        }

        System.out.println("Game over! Final balance: ₹" + balance);
        scanner.close();
    }
}

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What I Learned:

• Random class for generating unpredictable results — crucial for game logic.

• Loops & conditions combined to run the game continuously and check win/loss logic.

• Validating user input for bets and decisions keeps the game error-free.

• Using emojis made the console game more engaging!

• Practiced state management via the balance variable — keeping track of money.

• Thought carefully about how to compare symbols using .equals() method.

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🚗 2. CAR CLASS – Modeling a Real-World Object in Java

What does this class represent?

• A Car with attributes:

  • make (manufacturer)

  • model

  • year

  • price

  • isRunning (boolean to track whether the car engine is on)

• Behavior methods:

  • start()

  • stop()

  • drive()

  • brake()

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Code:

javaCopyEditpublic class Car {
    String make = "Toyota";
    String model = "Corolla";
    int year = 2020;
    double price = 1500000.0;
    boolean isRunning = false;  // Tracks if the car is currently running

    void start() {
        isRunning = true;
        System.out.println("🚗 Car started.");
    }

    void stop() {
        isRunning = false;
        System.out.println("🛑 Car stopped.");
    }

    void drive() {
        if (isRunning) {
            System.out.println("🏁 Car is driving.");
        } else {
            System.out.println("⚠️ Start the car first!");
        }
    }

    void brake() {
        System.out.println("🚦 Car is braking.");
    }
}

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What I Learned:

• Designing a class that mimics real-world entities — thinking of attributes and behaviors.

• Using a boolean flag (isRunning) to represent an internal state of the object and control behavior.

• Ensuring methods behave differently based on object state (car can't drive if not started).

• Reinforced method declaration, field initialization, and printing to console.

• Understanding how objects hold both data and behavior together.

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🛠️ 3. MAIN CLASS – Putting the Car Object to Work

What does this do?

• Creates a Car object.

• Prints its attributes.

• Calls its methods in order — start, drive, brake, stop.

• Prints the running state before and after actions.

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Code:

javaCopyEditpublic class Main {
    public static void main(String[] args) {
        Car car = new Car();

        System.out.println("🚘 Car Details:");
        System.out.println("Make: " + car.make);
        System.out.println("Model: " + car.model);
        System.out.println("Year: " + car.year);
        System.out.println("Price: ₹" + car.price);
        System.out.println("Running Status: " + car.isRunning);

        car.start();
        System.out.println("Running Status: " + car.isRunning);

        car.drive();
        car.brake();
        car.stop();

        System.out.println("Running Status: " + car.isRunning);
    }
}

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What I Learned:

• How to create objects from a class and call their methods using the dot operator ..

• Visualizing how data (attributes) and behavior (methods) live together in an object.

• Practiced method sequencing to simulate real-world usage.

• Became more confident with Java syntax for object creation and interaction.

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📘 Summary Table: What Java Day 8 Gave Me

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🫶 Final Thoughts

I’m really proud of Day 8 — not because I coded something complex, but because I enjoyed the process and understood how everything works together. Java is not just syntax or theory; it’s a powerful tool to bring ideas and simulations to life.

From now on, I want to keep mixing creativity with code and build things that are both fun and educational.

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