Virtusa Consulting Services Java Developer Interview Questions, Process, and Tips

Q1. Diff between abstract class and interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructor, fields, and methods, while interface cannot have any of these.

• A class can extend only one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define a common behavior among subclasses, while interfaces are used to define a contract for classes...read more
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Q2. Explain about handler methods
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Handler methods in Java are methods that are responsible for handling incoming requests and generating responses.
• Handler methods are typically defined in classes annotated with @Controller or @RestController.

• These methods are mapped to specific URLs using @RequestMapping or other mapping annotations.

• Handler methods can have parameters such as HttpServletRequest, HttpServletResponse, or model attributes.

• The return value...read more
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Q1. How we can achieve load balancing in spring bot
Ans. 
Load balancing in Spring Boot can be achieved using various techniques such as server-side load balancing, client-side load balancing, and using a load balancer.
• Server-side load balancing can be achieved by using technologies like Ribbon or Eureka in Spring Cloud.

• Client-side load balancing can be implemented by using technologies like Feign or RestTemplate in Spring Cloud.

• Using a load balancer like Nginx or Apache in f...read more
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Q2. Write SQL queries with conditional operator
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SQL queries with conditional operator
• Use CASE statement for conditional logic in SQL queries

• Syntax: SELECT column_name, CASE WHEN condition THEN value1 ELSE value2 END AS new_column_name FROM table_name

• Example: SELECT employee_name, CASE WHEN salary > 50000 THEN 'High' ELSE 'Low' END AS salary_category FROM employees
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General aptitude test of 1 hr

Coding questions for 2 hrs

Q1. They asked oops concepts and related real world scenario questions
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Q2. Basic java interview questions and sql questions
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Q1. Java concepts, Java JVM, JDK, JDE. Java awt, Java Struts, Java Classes.
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Q2. Polymorphism, abstraction, encapsulation, inheritance.
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Q3. Threads, multithreading. If, case structures. Java Applets
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