DigiMantra Senior Java Developer Interview Questions and Answers

Q1. Describe oops concept.
Ans. 
OOPs concept stands for Object-Oriented Programming, which is a programming paradigm based on the concept of objects.
• OOPs focuses on creating objects that contain both data and methods to manipulate that data.

• It emphasizes concepts like inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation restricts access to certain comp...read more
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Setup a cluster and find the bottleneck of performance.

Q1. Ways to deal with latency in Cassandra
Ans. 
Ways to optimize latency in Cassandra
• Use appropriate data modeling to reduce the number of queries needed

• Optimize queries by using appropriate indexes and clustering keys

• Tune the Cassandra configuration settings for better performance

• Use caching mechanisms like Memcached or Redis to reduce latency

• Consider using partitioning strategies to distribute data evenly across nodes
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Reasoning type ,numerical ,paragraph,quntitative apptitude

Q1. Java oops sql questions
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Q1. What is with sharing and without sharing
Ans. 
With sharing and without sharing are keywords in Salesforce that control the access level of records in Apex classes.
• With sharing enforces sharing rules and record-level access

• Without sharing ignores sharing rules and record-level access

• Use with sharing for classes that should respect sharing rules, like controllers for visualforce pages

• Use without sharing for classes that should have unrestricted access to records, li
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Q2. Can we call batch class from queueable?
Ans. 
Yes, we can call a batch class from a queueable class in Salesforce.
• Batch class can be called from a queueable class by implementing Database.executeBatch method.

• Queueable class can be used to chain batch jobs or execute them asynchronously.

• Example: Queueable class can be used to schedule a batch job to run at a later time.
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Asked about JavaScript Topics
1. Promise
2. Clousure
3. Hoisting.

Create an Application Routes are protected by different roles in ReactJS

Q1. What you want to join this company
Ans. 
I want to join this company because of its innovative projects and strong company culture.
• Innovative projects in AI and machine learning excite me

• Positive reviews from current employees about company culture

• Opportunities for growth and learning in the tech industry
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Q2. Where do you see yourself in 5 years
Ans. 
In 5 years, I see myself as a senior software engineer leading a team of developers on innovative projects.
• Advancing to a senior software engineer role

• Leading a team of developers on projects

• Working on innovative and challenging projects

• Continuing to learn and grow in the field
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Q3. What is most important to company good culture or handsome package or both and why
Ans. 
Both good culture and a handsome package are important for a company as they contribute to employee satisfaction and retention.
• A good culture fosters a positive work environment, promotes collaboration, and boosts employee morale.

• A handsome package attracts top talent, motivates employees to perform well, and reduces turnover rates.

• Having both good culture and a handsome package can lead to higher employee satisfaction...read more
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Q1. Reason for changing job and why should we hire you
Ans. 
Seeking new challenges and opportunities for growth. I bring a unique blend of skills and experience to add value to your team.
• Looking for new challenges and opportunities for professional growth

• Seeking a more dynamic work environment to utilize my skills effectively

• Excited about the possibility of contributing to a new team and organization

• Believe my diverse skill set and experience make me a valuable addition to your
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Q1. Real time DBA issues and scenarios
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Q2. Questions on HA and Always on
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