Pumex InfoTech Senior Software Engineer Interview Questions and Answers

SOLID is an acronym for five object-oriented design principles.

• SOLID principles help in creating software that is easy to maintain and extend.

• S - Single Responsibility Principle

• O - Open/Closed Principle

• L - Liskov Substitution Principle

• I - Interface Segregation Principle

• D - Dependency Inversion Principle

To configure 2 databases in Spring Boot, you can use multiple DataSource beans and specify them in application.properties.

• Define multiple DataSource beans in your configuration class

• Use @Primary annotation to specify the primary DataSource

• Use @Qualifier annotation to specify the secondary DataSource

• Configure the properties for each DataSource in application.properties

Concurrent hashmap is used for thread-safe operations in a multi-threaded environment.

• Concurrent hashmap allows multiple threads to read and write to the map concurrently without causing data corruption.

• It is useful in scenarios where multiple threads need to access and update a shared hashmap.

• Example: Implementing a cache system where multiple threads can read and write data concurrently.