Wonksknow Technologies Java Developer Trainee Interview Questions and Answers

Q1. Tell me about yourself
Ans. I am Dhanalakshmi.I was completed B.sc computer science in bharathiyar university.my native is tuticorin but currently lives in tirupur.i have four members in my family including me also....my father is business man,mother is an house wife.my brother is an pharmacist.i was interested in drawing and listening music...my hobby is an software engineer
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Q1. What is JAVA ,oops concepts related questions
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Aptitude tests are ability tests designed to assess your logical reasoning or mental ability .
Aptitude tests measure abilities such as :-
1) Numerical reasoning
2) verbal reasoning
3) diagrammatic reasoning
4) mechanical reasoning

I

Coding is the process of creating instructions for computers using programming languages, coding language examples are c ,c ++ , java etc
C , c++ are procedural language, java is object oriented programming language

Q1. Java & advance java,spring Boot
Ans. 
I m to get yourlife company to work.
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Q2. Check my skills
Ans. 
It's like technical round & Hr round , way of language speaking.
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Q3. I ability to doing work hard in this company
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Q4. I'm have read to extra work form this company
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Q5. I hope I think about me good everything it's OK thank you my side.
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Implementation of the Spring security

Q1. What is hashmap
Ans. 
HashMap is a data structure in Java that stores key-value pairs and allows fast retrieval of values based on keys.
• HashMap implements the Map interface in Java

• It allows null keys and values

• Keys in a HashMap must be unique

• Example: HashMap map = new HashMap<>()
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Q2. Internal Working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• 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.

• HashMap uses the hashCode() method of keys to calc...read more
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Q3. Compare Throw vs Throws
Ans. 
Throw is used to explicitly throw an exception in a method, while Throws is used to declare the exceptions that a method may throw.
• Throw is used within a method to throw an exception explicitly.

• Throws is used in the method signature to declare the exceptions that the method may throw.

• Throw is followed by an instance of Throwable class, while Throws is followed by the exception class names separated by commas.

• Example: t...read more
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Q4. Array vs Arraylist
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Arrays are fixed in size, while ArrayLists can dynamically resize. ArrayLists provide more flexibility and functionality.
• Arrays have a fixed size, while ArrayLists can dynamically resize.

• ArrayLists can easily add, remove, or modify elements, while arrays require manual shifting of elements.

• Arrays use [] syntax for declaration and initialization, while ArrayLists use the ArrayList class from the Java Collections framewo
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Q5. Arraylist vs LinkedList/Vector
Ans. 
ArrayList is resizable array implementation, LinkedList is doubly linked list implementation, Vector is synchronized version of ArrayList.
• ArrayList is faster for accessing elements, LinkedList is faster for adding/removing elements in middle.

• ArrayList uses less memory than LinkedList due to contiguous memory allocation.

• Vector is thread-safe but slower than ArrayList due to synchronization overhead.
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Q6. Write a code for Iterate hashmap using iterator
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Iterate through a hashmap using an iterator in Java
• Create an iterator using the entrySet() method of the hashmap

• Use a while loop to iterate through the hashmap entries

• Access the key and value of each entry using the getKey() and getValue() methods
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Q1. What are oops concept?
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Object-oriented programming concepts that focus on data encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and s
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Q1. 1. Abstraction vs Inheritance 2. What is Garbage collector? 3. What is class loader? 4. Spring security 5. Scopes of bean 6. Wait , notify and notify all 7. Class level vs object level local 8. Arraylist v...read more
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Java interview questions covering topics like abstraction, inheritance, garbage collector, class loader, Spring security, bean scopes, wait-notify, class vs object level local, ArrayList vs LinkedList, Singleton class, and RestController vs Controller.
• Abstraction focuses on hiding implementation details while inheritance allows a class to inherit properties and methods from another class.

• Garbage collector is a program ...read more
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Q2. 11. Qualifier 12. Deadlock 13. What is multi threading? 14. Lock vs Synchronisation 15. Checked vs unchecked exceptions 16. Diamond problem solution in java 8 17. Microservices advantages and disadvantag...read more
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Q1. Why to leave wipro ? Expected salary ? Desired location? Strength and weakness ? How you contribute being alone ?
Ans. 
I am leaving Wipro to explore new opportunities and challenges.
• Exploring new opportunities and challenges

• Seeking career growth

• Looking for a change in work environment

• Wanting to work with new technologies or industries

• Seeking better work-life balance
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For freshers there is online aptitude test.

Coding round is done by interviewers on live screen sharing

Q1. Here they discuss about projects and work in depth.
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Q1. Tell me about yourself? What are your hobbies? If you get chance to work with our company what is your expectations from us?
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Q2. Discuss about policies and work culture
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