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OBJECT ORIENTED CONCEPTS

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OOPS CONCEPTS  The popular object-oriented languages are Java, C#,php, Python,c++ etc. The main aim of object-oriented programming is to implement real-world entities.   Java is object oriented programming language. Object oriented programming features- 1) inheritance 2) encapsulation 3) abstraction 4) polymorphism    - run time polymorphism    - compile time polymorphism 5) association 6) composition 7) aggregation. Object Any entity that has state and behavior is known as an object. For example, a chair, pen, table, keyboard, bike, etc. It can be physical or logical. Class Collection of objects is called class. It is a logical entity. A class can also be defined as a blueprint from which you can create an individual object. Class doesn't consume any space.
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microservice cheat sheet

Absolutely! Here’s a Microservices Interview One-Liners Cheat Sheet — built for real-world Java/Spring Boot microservices interviews (3–6 years experience), especially useful for last-minute revision. ⚡ Microservices Interview One-Liners (Spring Boot Focused) 🔹 Microservices Basics Microservices = independent, small, loosely-coupled services focused on a single business capability. Communication is via REST APIs, gRPC, messaging queues, etc. They can be developed, deployed, and scaled independently. Avoid shared DB — use database-per-service pattern. 🔹 Service Communication Synchronous: REST, gRPC. Asynchronous: Kafka, RabbitMQ, JMS. DTOs (Data Transfer Objects) are used for API request/response. 🔹 API Gateway Handles routing, authentication, rate limiting, and logging. Common tools: Spring Cloud Gateway, Zuul, Kong, NGINX. Reduces coupling between clients and services. 🔹 Service Discovery Services register with Eureka or Consul. Other services discover them using lo...
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