TCS Interview Questions and Answers

Factory pattern creates objects without exposing the instantiation logic to the client.

• Create an interface or abstract class for the product

• Create concrete classes implementing the same interface/abstract class

• Create a factory class that returns the product

• Client uses the factory to create the object

C++ supports multiple inheritance, Java supports single inheritance. C++ has pointers, Java has references.

• C++ supports multiple inheritance, Java supports single inheritance

• C++ has pointers, Java has references

• C++ does not have built-in garbage collection, Java has automatic garbage collection

A 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.

• It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

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

• Example: HashMap map = new HashMap<>(); map.put("key1", 1); int value = map...read more

Collection framework in Java is a set of classes and interfaces that provide a standard way to store and manipulate groups of objects.

• Collection framework includes interfaces like List, Set, and Map, along with their respective implementations like ArrayList, HashSet, and HashMap.

• It provides methods to add, remove, and access elements in a collection, as well as perform operations like sorting and searching.

• Collections class provides utility methods like sorting, searching, a...read more

OTBI report stands for Oracle Transactional Business Intelligence report, used for analyzing and reporting on data in Oracle Cloud applications.

• OTBI reports provide real-time insights into business operations

• Users can create custom reports using OTBI subject areas

• OTBI reports can be scheduled for automated delivery

• OTBI reports can be accessed through Oracle Cloud applications such as ERP Cloud, HCM Cloud, and CX Cloud