Feuji Java Developer Interview Questions and Answers

Array duplicates and burn binary tree

Q1. Project specific
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Q1. Explain joins in SQL
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column between them

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• ...read more
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Q2. What are object and class in OOPs?
Ans. 
Objects are instances of classes in OOPs. Classes are blueprints for creating objects with attributes and methods.
• Objects are instances of classes

• Classes are blueprints for creating objects

• Classes define attributes and methods for objects

• Example: Class 'Car' with attributes like 'color' and methods like 'drive'
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In the first round test was conducted on hackerrank platform
it consist of one coding question and one sql question and total 4 mcq are there
the difficulty of coding(dsa) problem is leetcode medium-hard and sql is hard

Q1. 1. Maths puzzle 2. a dp question 3. questions on inheritance 4. some css related question 5. dom application and why we are using dom? 6. DBMS questions
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Q2. Dp question and then optimised to o(n) solution
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Q3. Questions on oops and inheritance
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Q1. 1. some projects that i did 2. why you want to join bizongo? 3. what will you bring to the company if we select you? 4. some behavioural questions...
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Q1. Linked List Palindrome
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Q2. Combination Sum
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DSA Round - Need to explain the answer

1hr, hacker rank, was a good problem to solve

Arrays and Pointers code

Q1. Project related questions
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Q2. Oops concept html css sql
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