Dassault Systemes Java Full Stack Developer Interview Questions and Answers

Q1. Design patterns
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Q2. OOPS Concept
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Q1. Questions related to 3GPP charging systems and protocols
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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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Q1. Questions from JavaScript, React and Node. 1st round. 2 coding questions on String and Array. Questions on Past employment experiece.
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Q1. Event Loop, SQL queries. 2 coding questions on Array and Strings.
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Q2. JavaScript and Node questions
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Q1. Why Oracle Cerner etc....
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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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Normal Aptitude questions, contains some find the output questions based on C programming. DBMS questions also there.

Q1. Binary Search, C programming Return statement.
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Q2. About internships.
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Q1. Very basic top 50 questions on internet, basic java, inheritance, oops, solid, collections
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Q2. Diff between abstract and interface, method overloading, overriding, microservices, how do microservice communicate
Ans. 
Abstract class is a class that cannot be instantiated, while an interface is a blueprint of a class with only abstract methods.
• Abstract class cannot be instantiated, but can have both abstract and non-abstract methods.

• Interface can only have abstract methods and cannot have method implementations.

• Method overloading is having multiple methods in the same class with the same name but different parameters.

• Method overridin...read more
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Q3. Spring boot annotations, DI, hibernate, bean scopes
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Q4. Fibonacci series print
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