MOCANU FILIP

_1_basics/src/main/java/code/_3_in_class/Salut.java

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+package code._3_in_class;
+
+public class Salut {
+    public static void main(String[] args) {
+        System.out.println("Hello world" +
+                "");
+    }
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/observer/Main.java

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+package clean.code.design_patterns.requirements.observer;
+
+// Usage example
+    public class Main {
+    public static void main(String[] args) {
+        // Create subject
+        StockMarket stockMarket = new StockMarket();
+
+        // Create observers
+        Observer client1 = new StockClient("Client 1");
+        Observer client2 = new StockClient("Client 2");
+        Observer client3 = new StockClient("Client 3");
+
+        // Register observers
+        stockMarket.registerObserver(client1);
+        stockMarket.registerObserver(client2);
+        stockMarket.registerObserver(client3);
+
+        // Set stock data, which will notify the observers
+        stockMarket.setStockData("ABC", 100.0);
+        stockMarket.setStockData("XYZ", 150.0);
+
+        // Unregister observer
+        stockMarket.unregisterObserver(client2);
+
+        // Set stock data again, only client1 and client3 will be notified
+        stockMarket.setStockData("DEF", 200.0);
+    }
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/observer/Observer.java

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+package clean.code.design_patterns.requirements.observer;
+// Observer interface
+interface Observer {
+    void update(String stockName, double price);
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/observer/StockClient.java

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+package clean.code.design_patterns.requirements.observer;
+// Concrete observer class
+class StockClient implements Observer {
+    private String name;
+
+    public StockClient(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public void update(String stockName, double price) {
+        System.out.println(name + " received an update for " + stockName + ": $" + price);
+    }
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/observer/StockMarket.java

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+package clean.code.design_patterns.requirements.observer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+// Concrete subject class
+class StockMarket implements Subject {
+    private List<Observer> observers = new ArrayList<>();
+    private String stockName;
+    private double price;
+
+    public void setStockData(String stockName, double price) {
+        this.stockName = stockName;
+        this.price = price;
+        notifyObservers();
+    }
+
+    @Override
+    public void registerObserver(Observer observer) {
+        observers.add(observer);
+    }
+
+    @Override
+    public void unregisterObserver(Observer observer) {
+        observers.remove(observer);
+    }
+
+    @Override
+    public void notifyObservers() {
+        for (Observer observer : observers) {
+            observer.update(stockName, price);
+        }
+    }
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/observer/Subject.java

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+package clean.code.design_patterns.requirements.observer;
+// Subject interface
+interface Subject {
+    void registerObserver(Observer observer);
+    void unregisterObserver(Observer observer);
+    void notifyObservers();
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/strategy/CreditCardStrategy.java

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+package clean.code.design_patterns.requirements.strategy;
+
+// Concrete strategy classes
+class CreditCardStrategy implements PaymentStrategy {
+    private String cardNumber;
+    private String expiryDate;
+    private String cvv;
+
+    public CreditCardStrategy(String cardNumber, String expiryDate, String cvv) {
+        this.cardNumber = cardNumber;
+        this.expiryDate = expiryDate;
+        this.cvv = cvv;
+    }
+
+    @Override
+    public void pay(double amount) {
+        System.out.println("Paying $" + amount + " using credit card: " + cardNumber);
+        // Add logic for credit card payment processing
+    }
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/strategy/Main.java

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+package clean.code.design_patterns.requirements.strategy;
+// Usage example
+public class Main {
+    public static void main(String[] args) {
+        // Create payment processor
+        PaymentProcessor paymentProcessor = new PaymentProcessor();
+
+        // Set credit card payment strategy
+        paymentProcessor.setPaymentStrategy(new CreditCardStrategy("1234567890", "12/25", "123"));
+
+        // Process payment
+        paymentProcessor.processPayment(100.0);
+
+        // Set PayPal payment strategy
+        paymentProcessor.setPaymentStrategy(new PayPalStrategy("example@gmail.com", "password"));
+
+        // Process payment
+        paymentProcessor.processPayment(50.0);
+    }
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/strategy/PayPalStrategy.java

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+package clean.code.design_patterns.requirements.strategy;
+class PayPalStrategy implements PaymentStrategy {
+    private String email;
+    private String password;
+
+    public PayPalStrategy(String email, String password) {
+        this.email = email;
+        this.password = password;
+    }
+
+    @Override
+    public void pay(double amount) {
+        System.out.println("Paying $" + amount + " using PayPal account: " + email);
+        // Add logic for PayPal payment processing
+    }
+}

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/strategy/PaymentProcessor.java

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+package clean.code.design_patterns.requirements.strategy;
+    // Context class
+    class PaymentProcessor {
+        private PaymentStrategy paymentStrategy;
+
+        public void setPaymentStrategy(PaymentStrategy paymentStrategy) {
+            this.paymentStrategy = paymentStrategy;
+        }
+
+        public void processPayment(double amount) {
+            paymentStrategy.pay(amount);
+        }
+    }

clean_code_projects/_2_project_requirements_design_patterns/src/main/java/clean/code/design_patterns/requirements/strategy/PaymentStrategy.java

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+package clean.code.design_patterns.requirements.strategy;
+// Strategy interface
+interface PaymentStrategy {
+    void pay(double amount);
+}