Cognizant Fullstack Java Developer Interview Questions and Answers for Experienced

General aptitude, logical reasoning, english and Pseudocodes

Q1. Self introduction Project- details, role Programming- Variables, recursion, Features,Arrays, strings, write prime number program.
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Q1. A senior in my current team was asking questions. He was helping to complete my answers. Be prepared with oops, collection, thread concepts, spring, hibernate basics thoroughly.
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Q1. Java api calling from angular application and all security and integration related question.
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Q2. Project structure related question
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Q1. Project structure design patterns
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Q1. Java Basic questions
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Q2. SpringBoot Basic questions
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Q3. Simple DSA problem: "introduction" find duplicate characters
Ans. 
Find duplicate characters in a given array of strings
• Iterate through each string in the array

• For each string, iterate through each character and store the count in a hashmap

• If the count of any character is greater than 1, it is a duplicate
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Q4. Write code for REST API using spring boot, include all annotation
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Code for REST API using Spring Boot with annotations
• Use @RestController annotation to define the class as a REST controller

• Use @RequestMapping annotation to map HTTP requests to handler methods

• Use @GetMapping, @PostMapping, @PutMapping, @DeleteMapping annotations for specific HTTP methods

• Use @PathVariable annotation to extract values from the URI

• Use @RequestBody annotation to bind HTTP request body to a method paramete
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Q1. Q1 - tell me about yourself After my introduction he directly jump into coding and asked me simple array manipulation question. Q3 - balanced string - you have a String = "()()()" or "(()" or "(()). The ou...read more
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Q1. The interviewers don't know how to speak English and are worst in communication. Q1 - Convert int a=123 to string. I told him you can do it with in built method but he asked me to do without it. I told h...read more
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Date -2 march 2023 ,Time 2-5pm , topics-Java

Q1. Tell me something about yourself.
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Q2. What is your Excepted salary?
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Q3. What is your greatest Strengths?
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Q4. Concept of Core-java & Advance-java
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Q5. Basic Interview Questions
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Q1. Java common question on hashmap, stream api
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Q1. Tell me about internal working of JVM
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Q2. Tell me about SAGA pattern in Microservices
Ans. 
SAGA pattern is a design pattern used in microservices architecture to manage distributed transactions.
• SAGA pattern breaks down a long-running transaction into a series of smaller, independent transactions.

• Each step in the SAGA pattern is a separate service that communicates with other services through events.

• If a step fails, compensating transactions are executed to rollback the changes made by previous steps.

• Example:...read more
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Q1. Tell me about your current project structure
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Q2. What is an API , how would you secure an API
Ans. 
API stands for Application Programming Interface. It defines the methods and data formats that applications can use to communicate with each other.
• API is a set of rules and protocols that allows different software applications to communicate with each other.

• To secure an API, you can use authentication methods like OAuth, API keys, or JWT tokens.

• Implementing encryption (HTTPS) and rate limiting can also enhance API secu...read more
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Q1. Why do you want to relocate to Bangalore
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Q2. Tell me about one instance where you faced pressure and how did you overcome ?
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