NTT Data Technical Analyst Interview Questions and Answers

HashMap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.

• HashMap uses a hash function to map keys to indices in an array called buckets.

• Collisions can occur when multiple keys hash to the same index, which is resolved using techniques like chaining or open addressing.

• HashMap provides constant-time complexity O(1) for basic operations like get, put, and remove.

• Example...read more

Use Spring Boot's multiple datasource configuration to work with 2 different databases

• Define multiple datasource configurations in application.properties or application.yml

• Create separate DataSource and JdbcTemplate beans for each database

• Use @Primary annotation to specify the primary datasource

• Use @Qualifier annotation to specify the secondary datasource

• Inject the appropriate datasource in your repository classes