Infosys Interview Questions, Process, and Tips

Collection is a group of objects while collections is a framework in Java. Collection interface is used to manipulate groups of objects.

• Collection is a group of objects while collections is a framework in Java

• Collection interface is used to manipulate groups of objects

• Collections framework provides classes like ArrayList, LinkedList, HashSet, etc.

• Collection interface extends Iterable interface and has methods like add(

HashMap is a data structure that stores key-value pairs and uses hashing to retrieve values quickly.

• HashMap uses an array of buckets to store key-value pairs

• Each bucket contains a linked list of entries with the same hash code

• When a key-value pair is added, its hash code is used to determine the bucket and added to the linked list

• When a value is retrieved, its hash code is used to find the bucket and then the linked li...read more

Multithreading is the ability of a CPU to execute multiple threads concurrently.

• Multithreading improves performance by utilizing idle CPU time.

• Example: A web server handling multiple requests simultaneously.

• Multithreading can lead to synchronization issues and race conditions.

• Thread safety can be achieved through locks and semaphores.

Spring Data JPA is a framework that simplifies the implementation of JPA-based repositories.

• Spring Data JPA provides a set of interfaces and classes to work with JPA entities and repositories.

• It supports various query methods and pagination.

• It also provides support for auditing, caching, and transactions.

• Example: @Repository interface UserRepository extends JpaRepository {}

Overloading is when a class has multiple methods with the same name but different parameters. Overriding is when a subclass provides its own implementation of a method from its superclass.

• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to change the behavior of a method in a subclass

• Overloading is resolved at compile-time while overriding is resolved at runtime

• ...read more

Spring Boot annotations simplify development and Lombok reduces boilerplate code.

• Spring Boot annotations provide a streamlined way to configure and run applications.

• Lombok reduces boilerplate code by generating getters, setters, constructors, and more.

• Spring Boot and Lombok work well together to create efficient and concise code.

• Examples of Spring Boot annotations include @SpringBootApplication, @RestController, and @A...read more