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10+ Codex Software Solution Interview Questions and Answers

Updated 24 Sep 2024
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Q1. What is difference between @primary and @Qualifier?

Ans.

Primary is used to define a primary bean when multiple beans of the same type are present, while Qualifier is used to specify which bean to autowire when multiple beans of the same type are present.

  • Primary annotation is used to give a higher preference to a bean when multiple beans of the same type are present in the Spring application context.

  • Qualifier annotation is used to specify which bean to autowire when multiple beans of the same type are present. It helps in resolving...read more

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Q2. How we can handle fault tolerance in Microservices?

Ans.

Fault tolerance in Microservices can be achieved through redundancy, graceful degradation, and circuit breakers.

  • Implementing redundancy by having multiple instances of each microservice running to handle failures.

  • Using graceful degradation to ensure that the system can still function even if certain microservices are unavailable.

  • Utilizing circuit breakers to prevent cascading failures by temporarily stopping requests to a failing microservice.

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Q3. Thread vs task in multiprocessing.. explain with examples

Ans.

Threads and tasks are both used in multiprocessing, but have different characteristics and use cases.

  • Threads are lightweight processes within a single process, sharing memory space. They are managed by the operating system.

  • Tasks are units of work that can be executed asynchronously. They are typically managed by a task scheduler.

  • Threads are suitable for parallel processing and improving performance, while tasks are useful for handling asynchronous operations and managing comp...read more

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Q4. How to implement spring security?

Ans.

Implementing Spring Security involves configuring security settings in the Spring application.

  • Add Spring Security dependency in pom.xml

  • Configure security settings in SecurityConfig class

  • Define user roles and permissions

  • Use annotations like @EnableWebSecurity and @Secured

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Q5. Difference between executors &executorservice?

Ans.

Executors are a class that provides factory and utility methods for Executor, ExecutorService is an interface that represents an asynchronous execution service.

  • Executors class provides factory and utility methods for Executor interface

  • ExecutorService is an interface that represents an asynchronous execution service

  • ExecutorService extends Executor interface

  • ExecutorService provides methods to manage termination and produce Future objects for tracking progress of one or more asy...read more

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Q6. Explain OAuth 2 implementation?

Ans.

OAuth 2 is an authorization framework that allows a third-party application to obtain limited access to an HTTP service.

  • OAuth 2 is used for delegated access, allowing a user to grant a third-party application access to their resources without sharing their credentials.

  • It involves the use of access tokens, which are issued by the authorization server after the user authenticates and authorizes the application.

  • OAuth 2 supports different grant types such as authorization code, i...read more

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Q7. Memory management in Java ?

Ans.

Java uses automatic memory management through garbage collection to allocate and deallocate memory.

  • Java uses garbage collection to automatically manage memory by deallocating objects that are no longer needed.

  • The JVM has a heap where objects are allocated and garbage collection is performed to reclaim memory.

  • Java provides the 'finalize()' method for objects to perform cleanup before they are garbage collected.

  • Memory leaks can occur in Java if objects are not properly derefere...read more

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Q8. Different types of gc?

Ans.

Different types of garbage collection algorithms in software development.

  • Mark and Sweep: Identifies and removes unreachable objects.

  • Generational: Divides objects into different generations based on age.

  • Parallel: Uses multiple threads to perform garbage collection concurrently.

  • Incremental: Spreads garbage collection work over multiple cycles to reduce pause times.

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Q9. ViewBag vs Tempdata in MVC

Ans.

ViewBag is used to pass data from controller to view, while TempData is used to pass data between controller actions.

  • ViewBag is a dynamic property that allows you to pass data from controller to view

  • TempData is a dictionary object that allows you to pass data between controller actions

  • ViewBag is not type-safe and requires typecasting, while TempData is type-safe

  • ViewBag data is lost if redirection occurs, while TempData data persists for the next request

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Q10. Abstract vs Interface

Ans.

Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

  • Abstract classes can have constructors, fields, and non-abstract methods.

  • Interfaces can only have abstract methods and constants.

  • A class can implement multiple interfaces but can only inherit from one abstract class.

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Q11. Optimization Techniques

Ans.

Optimization techniques are methods used to improve the efficiency and performance of software applications.

  • Use of algorithms like dynamic programming and greedy algorithms

  • Profiling and performance tuning to identify bottlenecks

  • Code refactoring to improve readability and maintainability

  • Utilizing caching and memoization for faster access to data

  • Parallel processing and multi-threading for improved concurrency

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Q12. Pagination in SQL

Ans.

Pagination in SQL allows for displaying a subset of query results at a time.

  • Use LIMIT and OFFSET clauses in SQL queries to implement pagination.

  • LIMIT specifies the maximum number of rows to return.

  • OFFSET specifies the number of rows to skip before starting to return rows.

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Q13. Arraylist find duplicate

Ans.

Find duplicates in an ArrayList of strings.

  • Iterate through the ArrayList and use a HashSet to keep track of seen elements.

  • If an element is already in the HashSet, it is a duplicate.

  • Store the duplicates in a separate ArrayList or print them directly.

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Interview Process at Codex Software Solution

based on 4 interviews
2 Interview rounds
Technical Round - 1
Technical Round - 2
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