Implementation of hashmap in Java 8, Bean lifecycle, difference between @Component and @Service, Front Controller, difference between PUT & PATCH, Authentication in REST APIs, how to disable junit test cases in particular environment during deployment

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The interview question covers topics like hashmap implementation in Java 8, bean lifecycle, annotations in Spring framework, HTTP methods, REST API authentication, and disabling junit test cases during deployment.

HashMap in Java 8 uses an array of linked lists to store key-value pairs, with the hash code of the key determining the index in the array.
Bean lifecycle in Spring framework involves initialization and destruction phases, managed by the container.
@Component and @Service are both annotations in Spring used for component scanning, but @Service is typically used for service layer classes.
Front Controller is a design pattern where a single controller handles all requests for a web application.
PUT is used to update or replace a resource entirely, while PATCH is used to make partial updates to a resource.
Authentication in REST APIs can be implemented using tokens, OAuth, or basic authentication.
To disable junit test cases in a particular environment during deployment, you can use profiles in Spring Boot or conditional annotations in JUnit.

Implementation of hashmap in Java 8, Bean lifecycle, difference between @Component and @Service, Front Controller, difference between PUT & PATCH, Authentication in REST APIs, how to disable junit test cases in particular environment during deployment

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Implementation of hashmap in Java 8, Bean lifecycle, difference between @Component and @Service, Front Controller, difference between PUT &amp; PATCH, Authentication in REST APIs, how to disable junit test cases in particular environment during deployment

Top EPAM Systems Senior Software Engineer interview questions & answers

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Top HR questions asked in EPAM Systems Senior Software Engineer

Implementation of hashmap in Java 8, Bean lifecycle, difference between @Component and @Service, Front Controller, difference between PUT & PATCH, Authentication in REST APIs, how to disable junit test cases in particular environment during deployment