6.6 Abstraction & Interfaces

// इंटरफ़ेस (Contract)
interface CloudStorageService {
    void uploadFile(String fileName);
    void deleteFile(String fileName);

    // Java 8 Default Method (सबको ऑटोमैटिक मिलेगा)
    default void logActivity(String action) {
        System.out.println("[AUDIT LOG] Action performed: " + action);
    }
}

class AWS_S3_Storage implements CloudStorageService {
    @Override
    public void uploadFile(String fileName) {
        System.out.println("Uploading " + fileName + " to AWS S3 Bucket...");
        logActivity("S3_UPLOAD");
    }

    @Override
    public void deleteFile(String fileName) {
        System.out.println("Deleting " + fileName + " from AWS S3 Bucket...");
    }
}

public class AbstractionDemo {
    public static void main(String[] args) {
        CloudStorageService cloud = new AWS_S3_Storage();
        cloud.uploadFile("resume.pdf");
    }
}