10+ DHIO Research & Engineering Interview Questions and Answers

Questions on OOPs features, carriage return, 2D matrix syntax, and nested loops in switch statement.

• OOPs features include encapsulation, inheritance, and polymorphism.

• A carriage return is a character that moves the cursor to the beginning of the next line.

• The syntax for making a 2D matrix is: int matrix[][] = new int[rows][columns];

• A nested loop in a switch statement is used to handle multiple cases with the same code block.

Abstraction is hiding implementation details while Interface is a contract for implementing classes.

• Abstraction is achieved through abstract classes and methods.

• Interface defines a set of methods that a class must implement.

• Abstraction focuses on hiding complexity and providing a simpler interface.

• Interface focuses on defining a standard for communication between classes.

• Abstraction is a way to achieve modularity and maintainability.

• Interface is a way to achieve polymorphism ...read more

Perform refers to carrying out a task or activity. Its types include job performance, academic performance, and athletic performance.

• Perform refers to the execution of a task or activity.

• Job performance refers to how well an employee performs their job duties.

• Academic performance refers to a student's success in their studies.

• Athletic performance refers to an athlete's ability to perform in their sport.

• Other types of performance include musical performance, theatrical perform...read more

A table is a physical storage structure while a view is a virtual table created from a query.

• A table stores data in a structured manner while a view is a virtual table created from a query.

• A table can have indexes and constraints while a view cannot.

• A table can be updated, inserted or deleted while a view cannot be directly modified.

• A view can be used to simplify complex queries or restrict access to certain columns of a table.

• Example: A table named 'employees' can have a vie...read more

The OSI model has 7 layers that define how data is transmitted over a network.

• The layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with the layers above and below it.

• For example, the Physical layer deals with the physical transmission of data, while the Application layer deals with user interfaces and applications.

• The OSI model is a conceptual model and is used to help understand ho...read more

DXC is a global IT services company that provides end-to-end solutions for clients in various industries.

• DXC was formed in 2017 through the merger of CSC and the Enterprise Services business of Hewlett Packard Enterprise.

• They offer services in areas such as cloud computing, cybersecurity, analytics, and digital transformation.

• DXC has clients in industries such as healthcare, finance, manufacturing, and government.

• They have a global workforce of over 130,000 employees.

• DXC is h...read more

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have different subclasses like circle, square, and triangle, each with their own implementation of the draw method.

• Example: A method can take in different types of objects as parameters, and the appropriate method will be called ba...read more

SQL Error 911 is a database connection error that occurs when the maximum number of concurrent connections has been reached.

• Occurs when the maximum number of concurrent connections has been reached

• Can be resolved by increasing the maximum number of connections allowed

• May also be caused by insufficient memory or disk space

• Commonly seen in IBM DB2 databases

I have used MySQL for practical in SQL subject.

• MySQL is a popular open-source relational database management system.

• I have practiced creating tables, querying data, and performing various operations in MySQL.

• I have also worked with MySQL Workbench for database design and management.

The latest technology I have learned is artificial intelligence (AI).

• AI is a branch of computer science that focuses on creating intelligent machines capable of performing tasks that typically require human intelligence.

• Some examples of AI applications include virtual assistants like Siri and Alexa, self-driving cars, and recommendation systems.

• I have learned about different AI techniques such as machine learning, natural language processing, and computer vision.

OS stands for Operating System. Paging is a memory management technique used by OS to store and retrieve data from secondary storage.

• OS is a software that manages computer hardware resources and provides common services for computer programs.

• Paging is a memory management scheme that eliminates the need for contiguous allocation of physical memory.

• Paging allows the operating system to use virtual memory, which is larger than physical memory.

• Examples of paging techniques includ...read more

Four pillars of OOPs are Abstraction, Encapsulation, Inheritance, and Polymorphism.

• Abstraction: Hiding implementation details and showing only necessary information.

• Encapsulation: Binding data and functions together and restricting access to data.

• Inheritance: Creating new classes from existing ones, inheriting properties and methods.

• Polymorphism: Ability of objects to take on multiple forms or behaviors.

Data structure is a way of organizing and storing data in a computer so that it can be accessed and used efficiently. A linked list is a linear data structure where elements are stored in nodes and each node points to the next node in the sequence.

• Data structure organizes and stores data efficiently

• Linked list is a linear data structure with nodes pointing to next node

• Example: Singly linked list, doubly linked list

To implement a project in SAP, you need to follow a structured approach involving planning, configuration, testing, and deployment.

• Define project scope and objectives

• Gather requirements from stakeholders

• Configure SAP system based on requirements

• Test the system to ensure functionality and performance

• Train end users on using the new system

• Deploy the project and monitor for any issues

• Provide ongoing support and maintenance

Java is a popular programming language, OOPs stands for Object-Oriented Programming, DSA refers to Data Structures and Algorithms.

• Java is a high-level, class-based, object-oriented programming language known for its portability and versatility.

• OOPs is a programming paradigm based on the concept of 'objects', which can contain data in the form of fields and code in the form of procedures.

• DSA involves the study of data structures (like arrays, linked lists, trees) and algorithm...read more

Data encapsulation is the process of hiding implementation details and exposing only necessary information.

• It is a fundamental concept in object-oriented programming.

• It helps in achieving data abstraction and information hiding.

• It allows for better control over data and prevents unauthorized access.

• Example: A class in Java that has private variables and public methods to access them.

• Example: A capsule that contains medicine and only allows access through a small opening.

Abstract classes are classes that cannot be instantiated and are meant to be subclassed.

• Abstract classes may contain abstract methods that must be implemented by subclasses.

• Abstract classes can have both abstract and concrete methods.

• An example of an abstract class in Java is 'Shape', with abstract methods like 'calculateArea' and concrete methods like 'draw'.