Dell Interview Questions and Answers

Collection is a framework that provides an architecture to store and manipulate a group of objects. StringBuilder and StringBuffer are classes used for manipulating strings, with StringBuffer being thread-safe.

• Collection is a framework in Java used to store and manipulate groups of objects.

• StringBuilder and StringBuffer are classes used for manipulating strings in Java.

• The main difference between StringBuilder and StringBuffer is that StringBuffer is thread-safe while StringB...read more

Template driven and reactive form example in Angular

• Use Angular's FormsModule and ReactiveFormsModule modules

• Create form controls using ngModel or formControl directives

• Implement form validation using built-in validators or custom validators

• Handle form submission using reactive approach with observables

A business contingency firm is a company that helps organizations plan for and respond to unexpected events or crises.

• Provides expertise in risk management and disaster recovery planning

• Assists in developing strategies to minimize disruptions to business operations

• Offers support in implementing emergency response protocols

• Examples: Deloitte, PricewaterhouseCoopers, KPMG

Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.

• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by providing a way to mock dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.

A comprehensive banking application with features like account management, transactions, loans, and customer support.

• Include features for account creation, management, and transactions

• Implement secure login and authentication methods

• Incorporate loan application and approval processes

• Provide customer support through chat or call center

• Include features for bill payments, fund transfers, and account statements

Joins in SQL are used to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• RIGHT JOIN returns all rows from the right table and the matched rows f...read more