Centelon Interview Questions, Process, and Tips

Improve your Logical Quotient, so that you can easily crack it.

Q1. Explain thread lifecycle.
Ans. 
Thread lifecycle refers to the various stages a thread goes through during its execution.
• A thread is created using the 'new' keyword or by implementing the 'Runnable' interface.

• The thread is started using the 'start()' method.

• During its execution, the thread can be in various states such as 'Runnable', 'Blocked', 'Waiting', etc.

• The thread can be interrupted using the 'interrupt()' method.

• The thread completes its execut...read more
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Q2. Explain profiling in Springboot
Ans. 
Profiling in Springboot is a way to measure and analyze the performance of an application.
• Profiling helps identify performance bottlenecks and optimize code

• Springboot provides built-in support for profiling through the use of various tools such as VisualVM and JProfiler

• Profiling can be done on both the server-side and client-side of the application

• Profiling can help identify memory leaks, CPU usage, and other performan
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Q3. Advantages of SQL over NoSQL
Ans. 
SQL is better for structured data and complex queries, while NoSQL is better for unstructured data and scalability.
• SQL is better for handling complex queries and transactions

• SQL databases have better data consistency and integrity

• NoSQL is better for handling unstructured data and scalability

• NoSQL databases are more flexible and can handle large amounts of data

• SQL databases are better suited for applications with a fixe...read more
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Q1. Explain your last project.
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Q1. JavaScript concepts
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Q2. JavaScript coding
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Q3. Angular questions
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Q1. Angular questions
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Q2. Angular implementation explanation
Ans. 
Angular implementation explanation
• Angular is a popular front-end framework for building web applications

• Uses TypeScript for development

• Components, services, modules, and directives are key concepts in Angular

• Data binding, dependency injection, and routing are important features

• Example: Creating a new component in Angular - ng generate component my-component
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Q1. Casual questions and discussion
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Q1. Salary discussion and casual discussion
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Q1. Difference between String and StringBuilder?
Ans. 
String is immutable, StringBuilder is mutable.
• String is immutable, meaning its value cannot be changed once it is created.

• StringBuilder is mutable, allowing for the modification of its value without creating a new object.

• String concatenation in a loop is more efficient with StringBuilder to avoid creating multiple String objects.

• StringBuilder has methods like append(), insert(), delete(), etc. for modifying its value.
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Q2. What are AWS services?
Ans. 
AWS services are a collection of cloud computing services provided by Amazon Web Services.
• Compute services (e.g. EC2, Lambda)

• Storage services (e.g. S3, EBS)

• Database services (e.g. RDS, DynamoDB)

• Networking services (e.g. VPC, Route 53)

• Analytics services (e.g. Redshift, Athena)

• Machine Learning services (e.g. SageMaker)

• Security services (e.g. IAM, KMS)
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30 min Aptitude Test

Q1. Some basic Sql questions, basic python, and project which i did on the college time
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