Oracle Cerner Mern Full Stack Developer Interview Questions and Answers

Q1. Singliton class
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Q2. Immutable class
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Q3. Most occured letter in string ? Problem to code
Ans. 
Find the most occurred letter in a given string.
• Iterate through the string and count the occurrences of each letter

• Store the counts in a map or array

• Find the letter with the highest count
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Q4. Global exception handler ?
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Q5. Design principle?
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Design principle is a set of guidelines that help software developers create maintainable and scalable code.
• Design principles help in creating code that is easy to understand, modify, and maintain.

• Examples of design principles include SOLID principles, DRY (Don't Repeat Yourself), KISS (Keep It Simple, Stupid), and YAGNI (You Aren't Gonna Need It).
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Few coding tasks asked like palindrome number
Factorial
Basic concept tests based on DSA
Like prove that set is unordered

Q1. If a glass is started filling with water by 1ml at 0sec and gets doubled at every successive second, at what second the glass is half full
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Q1. Questions about Nestjs, React and AI
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Q2. Singlet pattern of NestJS
Ans. 
Singleton pattern in NestJS ensures a class has only one instance and provides a global point of access to it.
• Use the @Injectable() decorator to mark a class as a singleton in NestJS.

• Inject the singleton class into other classes using the constructor.

• The instance of the singleton class will be shared across the application.
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Java assessment with core java mcq, coding and text answers

Q1. Technical interview on java and resume based questions with some riddles
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Q2. Technical questions
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Q1. Managerial round
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Q1. Project, Oops Concept, Java , which technology u have used ? Framework
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Q2. Framework, Explain Long Polling ,
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Long polling is a web technique where the client sends a request to the server and the server holds the connection open until new data is available.
• Long polling is a variation of the traditional polling technique where the client sends a request to the server and the server keeps the connection open until new data is available.

• It is often used in web applications to simulate real-time updates without the need for const...read more
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Q3. GraphQL Vs Rest
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GraphQL is a query language for APIs that allows clients to request only the data they need, while REST is an architectural style for designing networked applications.
• GraphQL allows clients to request specific data in a single request, reducing over-fetching and under-fetching of data.

• REST uses multiple endpoints for different resources, leading to multiple requests for related data.

• GraphQL provides a strongly typed sc...read more
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