Tietoevry Software Engineer Interview Questions and Answers for Experienced

ConcurrentHashMap is preferred for thread-safe operations, while HashMap and Hashtable are not.

• HashMap is not thread-safe and should not be used in a multi-threaded environment.

• Hashtable is thread-safe but has poor performance due to its synchronized nature.

• ConcurrentHashMap is thread-safe and has better performance than Hashtable due to its lock-free approach.

• Use ConcurrentHashMap when multiple threads are accessing t...read more

To create a REST API, define endpoints and HTTP methods. To create a REST client, use a library or make HTTP requests.

• Define endpoints and HTTP methods for the API

• Implement the API using a framework or library

• Test the API using tools like Postman

• To create a REST client, use a library like Retrofit or make HTTP requests using a library like OkHttp

• Parse the response from the API using a library like Gson