Java REST API Interview Questions and Answers for 7 years experience

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Java REST API Interview Questions (7 Years Experience)

  1. What is REST? Explain its architectural constraints.

    • Answer: REST, or Representational State Transfer, is a software architectural style that defines a set of constraints to be used for creating web services. These constraints include:
      • Client-Server: Client and server are independent of each other. The client doesn't need to know the internal workings of the server.
      • Stateless: Each request from the client to the server must contain all the information necessary to understand the request; the server doesn't store context between requests.
      • Cacheable: Responses must be identified as cacheable or non-cacheable to improve performance.
      • Uniform Interface: A standardized interface (usually HTTP) is used for communication between client and server. This includes using standard methods like GET, POST, PUT, DELETE.
      • Layered System: The architecture can be layered to improve scalability and maintainability. Clients don't need to know whether they are interacting directly with the final server or an intermediary.
      • Code on Demand (optional): The server can extend client functionality by transferring executable code. This is less common.

  2. Explain the difference between GET, POST, PUT, and DELETE HTTP methods.

    • Answer: These are the four core HTTP methods used in RESTful APIs, representing CRUD (Create, Read, Update, Delete) operations:
      • GET: Retrieves data from the server. It should be idempotent (calling it multiple times has the same effect as calling it once).
      • POST: Creates a new resource on the server. It's not idempotent.
      • PUT: Updates an existing resource on the server. It's idempotent (calling it multiple times with the same data has the same effect as calling it once).
      • DELETE: Deletes a resource from the server. It's idempotent.

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