10+ Capgemini Interview Questions and Answers

React is faster due to virtual DOM, default parameters provide fallback values, async functions can be called in useEffect

• React is faster than traditional DOM manipulation because it uses a virtual DOM to minimize actual DOM updates

• Default parameters in JavaScript allow you to specify default values for function parameters if no value is provided

• Async functions can be called in useEffect hook in React to perform asynchronous operations within a functional component

Sub flow in Mule is a reusable flow that can be called from other flows.

• Sub flow is a separate flow that can be called from other flows

• It helps in reusing the same logic in multiple flows

• Sub flow can have its own set of input and output parameters

• It can be used to encapsulate complex logic and make the main flow more readable

• Example: A sub flow for database connection that can be called from multiple flows

I have used design patterns such as Singleton, Factory, and Observer in my projects.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying the exact class of object that will be created.

• Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

Custom exceptions can be written by creating a new class that extends the Exception class.

• Create a new class that extends the Exception class

• Add a constructor to the custom exception class

• Throw the custom exception using 'throw new CustomException(message)'

throw is a keyword used to throw an exception, throws is used in method signature to declare exceptions thrown, and Throwable is a superclass for all exceptions and errors.

• throw is used to throw an exception in a try-catch block

• throws is used in method signature to declare exceptions that the method can throw

• Throwable is a superclass for all exceptions and errors in Java

A loop is a programming construct that repeats a set of instructions until a specific condition is met. Inheritance is a mechanism in object-oriented programming where a new class inherits properties and behaviors from an existing class.

• A loop allows a set of instructions to be executed repeatedly based on a condition. Examples include for loops, while loops, and do-while loops.

• Inheritance allows a new class (subclass) to inherit properties and behaviors from an existing clas...read more

A cursor is a database object used to retrieve data from a result set one row at a time.

• Cursor is used in SQL to fetch and manipulate data row by row

• Examples of cursor include FETCH, OPEN, CLOSE, and DECLARE

• Cursor is often used in stored procedures and triggers

Oracle database structure refers to the organization of data in tables, indexes, views, and other database objects.

• Consists of tables, which store data in rows and columns

• Includes indexes for faster data retrieval

• Views provide virtual representations of data from one or more tables

• Constraints ensure data integrity and enforce rules

• Stored procedures and functions for processing data

A choice router is a device or software that directs incoming data packets to the appropriate destination based on predefined rules or user preferences.

• A choice router is used in computer networks to manage and control the flow of data.

• It examines the header information of incoming packets to determine the best path for forwarding the data.

• Choice routers can be hardware devices or software programs.

• They can be configured to prioritize certain types of traffic or apply specifi...read more

Internal structure of collections refers to the organization and arrangement of data within a collection.

• Collections can be organized using various data structures such as arrays, linked lists, trees, and hash tables.

• The choice of data structure depends on the type of data being stored and the operations that need to be performed on the collection.

• For example, an array is a good choice for collections with fixed size and random access, while a linked list is better for collec...read more

Materialized views are precomputed views stored on disk for faster query performance.

• Materialized views store the results of a query on disk so that the query can be run faster in the future.

• They are updated periodically to reflect changes in the underlying data.

• Materialized views are commonly used in data warehousing and reporting applications.

• Examples of materialized views include summary tables, aggregated data, and complex joins.

Partition is the division of a physical or logical structure into multiple parts.

• Partitioning helps in organizing data, improving performance, and increasing efficiency.

• Examples include disk partitioning in a computer system, partitioning of a database table for better management, and partitioning of a hard drive for separate storage areas.

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

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of keys to calculate the hash value.

• HashMap allows null keys an...read more

Microservices are a software development technique that structures an application as a collection of loosely coupled services.

• Each service is self-contained and can be developed, deployed, and scaled independently

• Promotes flexibility, scalability, and resilience in software development

• Allows for different technologies to be used for different services

• Enables teams to work on different services simultaneously

• Facilitates easier maintenance and updates

Java program to print 'Hello, World!'

• Create a class with a main method

• Use System.out.println() to print the message

• Compile and run the program