Wissen Technology Software Developer Interview Questions, Process, and Tips

I have provided a question with time limitation. The question was a medium level and it was based on my previous experience and current role.

Q1. Create a React application based on the given requirements
Ans. 
Create a React application based on given requirements
• Start by setting up a new React project using create-react-app

• Identify the components needed based on the requirements

• Implement state management using React hooks or Redux

• Fetch data from an API if required and display it in the application

• Ensure responsive design and user-friendly interface
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Q2. Question was related to asynchronous javascript
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5 questions which includes programming and sql questions.

Q1. Internal working of hashmap?
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed a...read more
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Q1. Constructors and overridding of functions in hashmap
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Constructors are used to initialize objects, while overriding functions in HashMap allows custom behavior for key-value pairs.
• Constructors in HashMap are used to initialize the HashMap object with a specified initial capacity and load factor.

• Overriding functions in HashMap allows custom behavior for methods like put(), get(), and remove().

• Example: Overriding the put() method in a custom HashMap implementation to perfor...read more
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Q1. I was asked kodane's algorithm and coding question which I had to solve using java 8 and two SQL questions which had essence of group by.
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Q1. They had immediate requirement so they wanted someone who can join within 15 days.I said that is not possible so no further interview.
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Had given 2 java question which one is medium and other one was easy.

Q1. Circular linked list question
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Q2. SQL, dbms, oops connector basic question
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Q3. What is abstraction and encapsulation
Ans. 
Abstraction is the concept of hiding complex implementation details and showing only the necessary information. Encapsulation is bundling data and methods that operate on the data into a single unit.
• Abstraction focuses on what an object does rather than how it does it

• Encapsulation restricts access to some of an object's components, protecting the object's integrity

• Abstraction allows for easier maintenance and modificat...read more
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Q4. Primary key, difference between primary key and super key
Ans. 
Primary key uniquely identifies a record in a table, while super key is a set of attributes that can uniquely identify a record.
• Primary key is a subset of super key

• Primary key cannot have NULL values, while super key can

• Example: In a table 'Employee', 'EmployeeID' can be a primary key as it uniquely identifies each employee record, while 'EmployeeID, DepartmentID' can be a super key
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