What is garbage collection in .NET?

Garbage collection automatically frees unused memory.

Which collection stores key-value pairs in C#?

Dictionary stores data as key-value pairs.

What is inheritance in OOP?

Inheritance allows a class to inherit features from another class.

What is encapsulation?

Encapsulation binds data and methods within a class.

Which keyword prevents a class from being inherited?

sealed prevents other classes from inheriting a class.

What is polymorphism?

Polymorphism allows methods or objects to behave differently.

Which keyword is used for exception handling?

Exception handling in C# uses try, catch, and finally blocks.

What is an interface in C#?

Interfaces define contracts for implementing classes.

Which keyword creates an object in C#?

The new keyword instantiates objects.

What is LINQ used for?

LINQ simplifies querying data collections in .NET.

Interview QuestionsIntermediateFresher

Top 50 Java Developer Interview Questions & Answers (2026)

This guide covers the exact questions real interviewers ask for Java Developer roles. Each question includes a detailed answer, code example where relevant and a key takeaway.

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.NET is a framework developed by Microsoft for building applications.

Key takeaway:A software development framework by Microsoft u2014 .NET is a framework developed by Microsoft for building applications.

C# is the primary programming language used in .NET development.

Key takeaway:C# u2014 C# is the primary programming language used in .NET development.

CLR manages execution of .NET programs including memory management and security.

Key takeaway:Common Language Runtime u2014 CLR manages execution of .NET programs including memory management and security.

C# source code files use the .cs extension.

Key takeaway:.cs u2014 C# source code files use the .cs extension.

Visual Studio is Microsoft's integrated development environment.

Key takeaway:An IDE for software development u2014 Visual Studio is Microsoft's integrated development environment.

The class keyword defines a class in C#.

Key takeaway:class u2014 The class keyword defines a class in C#.

Class members are private by default in C#.

Key takeaway:private u2014 Class members are private by default in C#.

Statements in C# end with a semicolon.

Key takeaway:; u2014 Statements in C# end with a semicolon.

ASP.NET is used to develop dynamic web applications and APIs.

Key takeaway:Web application development u2014 ASP.NET is used to develop dynamic web applications and APIs.

Main() is the entry point of C# applications.

Key takeaway:Main() u2014 Main() is the entry point of C# applications.

Dependency Injection improves modularity and testability.

Key takeaway:Providing dependencies externally u2014 Dependency Injection improves modularity and testability.

Abstract classes may contain implemented methods while interfaces define behavior contracts.

Key takeaway:Abstract classes can have implementation while interfaces mainly define contracts u2014 Abstract classes may contain implemented methods while interfaces define behavior contracts.

Async programming improves responsiveness by avoiding blocking operations.

Key takeaway:Executing tasks without blocking main thread u2014 Async programming improves responsiveness by avoiding blocking operations.

async and await simplify asynchronous operations in C#.

Key takeaway:await and async u2014 async and await simplify asynchronous operations in C#.

Entity Framework maps database tables to .NET objects.

Key takeaway:ORM framework for .NET u2014 Entity Framework maps database tables to .NET objects.

Middleware processes HTTP requests and responses in ASP.NET Core.

Key takeaway:Software component in request pipeline u2014 Middleware processes HTTP requests and responses in ASP.NET Core.

appsettings.json stores application configuration values.

Key takeaway:Store configuration settings u2014 appsettings.json stores application configuration values.

JWT tokens securely transmit authentication information.

Key takeaway:Authentication and authorization u2014 JWT tokens securely transmit authentication information.

NuGet distributes reusable .NET packages and dependencies.

Key takeaway:Reusable .NET library package u2014 NuGet distributes reusable .NET packages and dependencies.

Model binding maps HTTP request values to action parameters or models.

Key takeaway:Mapping request data to objects u2014 Model binding maps HTTP request values to action parameters or models.

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Caching reduces repeated database access and improves performance.

Key takeaway:Caching u2014 Caching reduces repeated database access and improves performance.

Repository Pattern abstracts and centralizes data access logic.

Key takeaway:Repository Pattern u2014 Repository Pattern abstracts and centralizes data access logic.

ASP.NET Core Web API is designed for RESTful JSON APIs.

Key takeaway:ASP.NET Core Web API u2014 ASP.NET Core Web API is designed for RESTful JSON APIs.

Proper exception handling prevents application crashes.

Key takeaway:Exception handling u2014 Proper exception handling prevents application crashes.

JWT provides secure token-based authentication.

Key takeaway:JWT Authentication u2014 JWT provides secure token-based authentication.

Asynchronous programming improves scalability and responsiveness.

Key takeaway:Asynchronous programming u2014 Asynchronous programming improves scalability and responsiveness.

Entity Framework supports database-first and code-first approaches.

Key takeaway:Entity Framework u2014 Entity Framework supports database-first and code-first approaches.

MVC separates concerns into Model, View, and Controller.

Key takeaway:MVC architecture u2014 MVC separates concerns into Model, View, and Controller.

[Authorize] restricts API access to authenticated users.

Key takeaway:[Authorize] u2014 [Authorize] restricts API access to authenticated users.

Logging frameworks help track and analyze application issues.

Key takeaway:Logging framework u2014 Logging frameworks help track and analyze application issues.

Value types contain actual data; reference types point to memory locations.

Key takeaway:Value types store data directly while reference types store references u2014 Value types contain actual data; reference types point to memory locations.

Queue follows First-In-First-Out order.

Key takeaway:Queue u2014 Queue follows First-In-First-Out order.

Boxing converts a value type into a reference type object.

Key takeaway:Converting value type to object type u2014 Boxing converts a value type into a reference type object.

Unboxing extracts the value type from an object.

Key takeaway:Converting object back to value type u2014 Unboxing extracts the value type from an object.

IDisposable releases unmanaged resources using Dispose().

Key takeaway:Handle unmanaged resource cleanup u2014 IDisposable releases unmanaged resources using Dispose().

const defines compile-time constant values.

Key takeaway:const u2014 const defines compile-time constant values.

async Task supports proper async flow and exception handling.

Key takeaway:Better exception handling and await support u2014 async Task supports proper async flow and exception handling.

Dependency inversion improves flexibility and maintainability.

Key takeaway:High-level modules should depend on abstractions u2014 Dependency inversion improves flexibility and maintainability.

Swagger generates interactive API documentation.

Key takeaway:API documentation and testing u2014 Swagger generates interactive API documentation.

ASP.NET Core is cross-platform, lightweight, and high-performing.

Key takeaway:Cross-platform support and improved performance u2014 ASP.NET Core is cross-platform, lightweight, and high-performing.

WATCH OUT

5 Mistakes That Cost Java Developer Candidates the Job

Interviewers watch for these red flags — not just knowledge gaps.

Memorising Without Understanding

Candidates who memorise answers without understanding concepts fall apart when interviewers ask follow-up questions.

Fix: Understand the why behind every answer

No Real-World Examples Ready

Saying 'I know this' without a concrete example is a red flag. Interviewers want applied knowledge not just theory.

Fix: Prepare one real example per concept

Ignoring Edge Cases

Only answering the happy path shows shallow thinking. Interviewers test if you think about what can go wrong.

Fix: Always ask yourself what could fail

Freezing Under Pressure

Silence is worse than saying 'Let me think through this'. Composure and structured thinking matter as much as the answer.

Fix: Practice thinking aloud every day

Never Testing Their Readiness

Most candidates feel ready but have never actually measured themselves. The gap you don't know about is the most dangerous.

Fix: Take the free assessment before your interview

BEFORE YOUR NEXT INTERVIEW

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Top 50 UI/UX Designer Interview Questions & Answers (2026)

Read Guide →

Top 50 Java Developer Interview Questions & Answers (2026)

You have read 30 questions. Now test yourself.

5 Mistakes That Cost Java Developer Candidates the Job

Memorising Without Understanding

No Real-World Examples Ready

Ignoring Edge Cases

Freezing Under Pressure

Never Testing Their Readiness

Stop Guessing. Know Exactly Where You Stand in Java Developer.

Related Guides

Top 50 Customer Support Interview Questions & Answers (2026)

Top 50 Web Designer Interview Questions & Answers (2026)

Top 50 UI/UX Designer Interview Questions & Answers (2026)

Assessment

Opportunities

Company

Legal

Top 50 Java Developer Interview Questions & Answers (2026)

Q1What is .NET?

Q2Which language is most commonly used with .NET?

Q3What is CLR in .NET?

Q4Which file extension is used for C# source files?

Q5What is Visual Studio?

Q6Which keyword is used to define a class in C#?

Q7What is the default access modifier for class members in C#?

Q8Which symbol ends a statement in C#?

Q9What is ASP.NET primarily used for?

Q10Which method is the entry point of a C# application?

Q11What is garbage collection in .NET?

Q12Which collection stores key-value pairs in C#?

Q13What is inheritance in OOP?

Q14What is encapsulation?

Q15Which keyword prevents a class from being inherited?

Q16What is polymorphism?

Q17Which keyword is used for exception handling?

Q18What is an interface in C#?

Q19Which keyword creates an object in C#?

Q20What is LINQ used for?

Q21What is dependency injection?

Q22What is the difference between abstract class and interface?

Q23What is asynchronous programming in .NET?

Q24Which keywords support asynchronous programming?

Q25What is Entity Framework?

Q26What is middleware in ASP.NET Core?

Q27What is the purpose of appsettings.json?

Q28What is JWT commonly used for?

Q29What is a NuGet package?

Q30What is model binding in ASP.NET Core?

You have read 30 questions. Now test yourself.

Q31An application becomes slow due to repeated database calls. What should you use?

Q32You need reusable data access logic. Which pattern is suitable?

Q33A web API should return JSON responses. Which ASP.NET feature supports this naturally?

Q34An exception occurs but the application should continue running safely. What should you implement?

Q35You need to authenticate users securely. Which approach is commonly used?

Q36Your application needs to support many concurrent users efficiently. What should you prefer?

Q37A project requires database-first ORM support. Which technology should you use?

Q38You want to separate business logic from controllers. Which architecture helps?

Q39An API endpoint should be protected from unauthorized access. Which attribute is commonly used?

Q40You need centralized logging for application errors. What should you implement?

Q41What is the difference between value type and reference type?

Q42Which collection provides FIFO behavior?

Q43What is boxing in C#?

Q44What is unboxing?

Q45What is the purpose of IDisposable interface?

Q46Which keyword creates a constant value in C#?

Q47What is the purpose of async Task instead of async void?

Q48What is dependency inversion principle?

Q49What is the purpose of Swagger in ASP.NET Core?

Q50What is the primary advantage of ASP.NET Core over older ASP.NET?

5 Mistakes That Cost Java Developer Candidates the Job

Memorising Without Understanding

No Real-World Examples Ready

Ignoring Edge Cases

Freezing Under Pressure

Never Testing Their Readiness

Stop Guessing. Know Exactly Where You Stand in Java Developer.

Related Guides

Top 50 Customer Support Interview Questions & Answers (2026)

Top 50 Web Designer Interview Questions & Answers (2026)

Top 50 UI/UX Designer Interview Questions & Answers (2026)

Assessment

Opportunities

Company

Legal