Cognizant Fullstack Java Developer Interview Questions and Answers

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. Introduce yourself ?
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Q2. What are the courses you are familiar with ?
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Q3. Explain oops concept in java
Ans. 
OOPs concept in Java is a programming paradigm that focuses on objects and their interactions.
• OOPs stands for Object-Oriented Programming.

• It involves the use of classes, objects, inheritance, polymorphism, and encapsulation.

• Classes are blueprints for creating objects, and objects are instances of classes.

• Inheritance allows classes to inherit properties and behaviors from other classes.

• Polymorphism allows objects of dif...read more
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Q4. Write a palindrome program in java
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A palindrome program in Java checks if a given string is the same when read forwards and backwards.
• Convert the string to lowercase to ignore case sensitivity.

• Use two pointers, one starting from the beginning and the other from the end of the string.

• Compare the characters at the two pointers, moving them towards the center until they meet or cross each other.

• If at any point the characters are not equal, the string is no...read more
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Q5. Create a table questions in mysql
Ans. 
Creating a table named 'questions' in MySQL.
• Use the CREATE TABLE statement to create the table.

• Specify the table name, column names, and their data types.

• Set primary key, foreign key, and other constraints if required.

• Add any additional properties like auto-increment, default values, etc.

• Execute the SQL statement to create the table.
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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. Question related in resume skills and for company improvement knowledge
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Q2. Personal information
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4 senior interviewer in group discus

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. SQL - a table with emp-id, emp-name, manager-id, Need to find the manger name for each emplyee.
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Q2. FizzBuzz - if number is divisible by 3 print "fizz", if by 5 print "buzz", if by both "fizzbuzz"
Ans. 
A simple program to print 'fizz' for multiples of 3, 'buzz' for multiples of 5, and 'fizzbuzz' for multiples of both.
• Iterate through numbers from 1 to n.

• Use modulo operator to check divisibility by 3 and 5.

• Print 'fizz', 'buzz', or 'fizzbuzz' accordingly.
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Q3. Is it necessary for classes implementing an interface to implement interface methods?
Ans. 
Yes, classes implementing an interface must implement interface methods.
• Classes implementing an interface must provide concrete implementations for all methods declared in the interface.

• Failure to implement all interface methods will result in a compilation error.

• Interfaces are used to define a contract that implementing classes must adhere to.
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Q4. Spring basics - annotations
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Q1. Spring boot basics
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Q1. Talked about my previous companies and salary. Before they conduct the interview I had told them my expectation, while negotiation they denied for providing that and were offering just 10% hike over my cur...read more
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Q1. Java common question on hashmap, stream api
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