Add creational patterns, Interpreter; remove scripts; update README

01-creational/factory-method/EmailNotification.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+public class EmailNotification implements Notification {
+    private final String email;
+    public EmailNotification(String email) { this.email = email; }
+
+    @Override
+    public void send(String message) {
+        System.out.println("Email -> " + email + ": " + message);
+    }
+}

01-creational/factory-method/EmailService.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+public class EmailService extends NotificationService {
+    private final String email;
+    public EmailService(String email) { this.email = email; }
+
+    @Override
+    protected Notification createNotification() {
+        return new EmailNotification(email);
+    }
+}

01-creational/factory-method/Main.java

@@ -0,0 +1,17 @@
+package factorymethod;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("=== Factory Method Pattern Demo ===\n");
+
+        NotificationService[] services = {
+            new EmailService("alice@example.com"),
+            new SmsService("+1-555-0123"),
+            new PushService("device-token-abc123")
+        };
+
+        for (NotificationService service : services) {
+            service.notifyUser("Your order #1042 has been shipped!");
+        }
+    }
+}

01-creational/factory-method/Notification.java

@@ -0,0 +1,5 @@
+package factorymethod;
+
+public interface Notification {
+    void send(String message);
+}

01-creational/factory-method/NotificationService.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+/** Creator - declares the factory method */
+public abstract class NotificationService {
+    protected abstract Notification createNotification();
+
+    public void notifyUser(String message) {
+        Notification n = createNotification();
+        n.send(message);
+    }
+}

01-creational/factory-method/PushNotification.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+public class PushNotification implements Notification {
+    private final String deviceToken;
+    public PushNotification(String deviceToken) { this.deviceToken = deviceToken; }
+
+    @Override
+    public void send(String message) {
+        System.out.println("Push -> " + deviceToken + ": " + message);
+    }
+}

01-creational/factory-method/PushService.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+public class PushService extends NotificationService {
+    private final String token;
+    public PushService(String token) { this.token = token; }
+
+    @Override
+    protected Notification createNotification() {
+        return new PushNotification(token);
+    }
+}

01-creational/factory-method/SmsNotification.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+public class SmsNotification implements Notification {
+    private final String phone;
+    public SmsNotification(String phone) { this.phone = phone; }
+
+    @Override
+    public void send(String message) {
+        System.out.println("SMS -> " + phone + ": " + message);
+    }
+}

01-creational/factory-method/SmsService.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+public class SmsService extends NotificationService {
+    private final String phone;
+    public SmsService(String phone) { this.phone = phone; }
+
+    @Override
+    protected Notification createNotification() {
+        return new SmsNotification(phone);
+    }
+}