Core Java questions - array list , hashmap, string
Junior Java Developer Interview Questions
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Core Java & OOPs: Explain OOPs concepts with real-world examples. Difference between String, StringBuilder, and StringBuffer. How Garbage Collection works in Java. Why String is immutable in Java. HashMap vs LinkedHashMap vs TreeMap. HashMap vs ConcurrentHashMap & internal working. Spring Boot & Hibernate: Spring Boot Auto-Configuration explained. Difference between @Component, @Service, and @Repository. Pagination & Sorting in Spring Data JPA. EAGER vs LAZY fetching in Hibernate. Global Exception Handling in Spring Boot. Database & SQL: SQL query to fetch the second-highest salary. How to find duplicate records in a table. INNER JOIN vs LEFT JOIN. DevOps & Others: Docker usage in deployments. REST vs SOAP APIs. Strategies to improve application performance in Java. 💡 Additionally, there was a project-related discussion around my academic work.
Describe the SQL joins. (Inner Join, Right Join, Left join, Full Outter Join)
What is the difference between Authboxing and Unboxing
What is the difference between static and final keywords
Java basics, OOP concepts, SQL schema
Core java , database, project
core java concepts, oops, multithreading, exception handling, etc
Questions om core java, advance java , spring
polymorphism programme by passing reference variable to the object.
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