Busibud 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
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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. Hash map implementation
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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
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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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