NullClass Fullstack Java Developer Interview Questions and Answers

Q1. Tell you about me self
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Q2. Coding test for me
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Q3. Servlet question
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Q4. Jdbc question and mysql database
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Q5. What is cookie ? why use to create web application
Ans. 
A cookie is a small piece of data stored on the user's computer by the web browser, used to track user activity and personalize user experience.
• Cookies are used to store user preferences, login information, and shopping cart items.

• They help websites remember users and their preferences, making the browsing experience more personalized.

• Cookies can also be used for tracking user behavior, such as analyzing website traffi...read more
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Core java, servlet ,jdbc

Q1. Tell me about yourself?
Ans. •I'm Akashdeep Prasad. • I'm in my early twenties. • I'm born and brought up in Mumbai, Andheri but currently I'm reside in Thane. - Now, coming to my highest qualification :- • I have completed my graduation in Bachelor of Science in Information Technology from University of Mumbai. - I like to share my certification with you :- • I'm certified Java Full Stack Developer. - Sir, I like to share my hobbies with you :...read more
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Q2. Why should I hire you ?
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Q3. What is your salary expectation?
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Q1. I forgot question
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Q1. I can't remember what questions asked
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Q1. Hash map implementation
Ans. 
Hash map is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hash map uses hashing to map keys to indices in an array.

• It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

• Example: HashMap map = new HashMap<>(); map.put("key", 123); int value = map.get("key");
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Q1. Remove duplicate value in arraylist
Ans. 
Use a HashSet to remove duplicates from an ArrayList of strings.
• Create a HashSet and add all elements from the ArrayList to it.

• Clear the ArrayList and then add all elements back from the HashSet.
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Basic coding like prime number,palindrome ,patterns

Q1. All academic questions in depth
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Q2. Operatingsystem
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Q3. Database completely like writethe queryif yougiven the requirements
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Q4. Data structures
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Q5. Web development
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Q1. Tell me about your technical experience
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Q1. What is your expected salary
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Simple aptitude question

Simple functional coding round