Infosys Associate Software Engineer Interview Questions and Answers

Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.

• Abstract class can have constructors, fields, and methods, while interface cannot have any of these.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes are used to provide a common base for multiple classes, while interfaces define a contract that implementin...read more

Static and final keywords are used in Java to define class-level variables and constants respectively.

• Static keyword is used to define class-level variables and methods, which are shared among all instances of the class.

• Final keyword is used to define constants that cannot be changed once initialized.

• Static variables are accessed using the class name, while final variables are accessed using object references.

• Example: ...read more

datesInPeriod returns dates within a specified range, while datesInBetween focuses on dates strictly between two endpoints.

• datesInPeriod includes start and end dates in the result.

• Example: datesInPeriod('2023-01-01', '2023-01-10') returns dates from Jan 1 to Jan 10.

• datesInBetween excludes the start and end dates.

• Example: datesInBetween('2023-01-01', '2023-01-10') returns dates from Jan 2 to Jan 9.

• datesInPeriod is usefu...read more

Row level security restricts data access at the row level based on user roles or attributes.

• Enables fine-grained access control to database rows.

• Users can only see data they are authorized to access.

• Example: A sales database where sales reps can only view their own sales records.

• Implemented using policies or filters in database systems like PostgreSQL.

• Helps in compliance with data privacy regulations.

Aggregation is a concept in object-oriented programming where one object is composed of multiple objects.

• Aggregation is a form of association where one class contains references to other classes.

• It represents a 'has-a' relationship between objects.

• For example, a car has an engine, wheels, and seats.

• Stacks are data structures that follow the Last-In-First-Out (LIFO) principle.

• They are used to store and retrieve data in ...read more

Multi threading is a technique to execute multiple threads concurrently, improving performance and responsiveness.

• Threads are lightweight processes that share the same memory space.

• They can be created using classes like Thread or by implementing the Runnable interface.

• Thread synchronization is important to avoid race conditions and ensure data integrity.

• Common multi-threading concepts include thread pools, locks, semap...read more