MSCI Vice President Engineering Interview Questions, Process, and Tips

Simple java questions, one coding question and one design question

Q1. What is visitor pattern?
Ans. 
Visitor pattern is a design pattern where a visitor class is used to perform operations on elements of a data structure.
• Visitor pattern allows adding new operations to existing classes without modifying them

• It separates the algorithm from the object structure on which it operates

• Commonly used in compilers, interpreters, and other complex systems
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Q2. You have a 2d array {{1,2},{1,3},{5,6}}. Calculate the sum of elements of 1st position in every array with Java 8.
Ans. 
Calculate sum of elements at 1st position in each array using Java 8.
• Use Java 8 stream to map each array to its 1st element and then sum them up.

• Example: {{1,2},{1,3},{5,6}} -> 1 + 1 + 5 = 7
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Q3. Design Thread collector class
Ans. 
Thread collector class to manage and organize threads in a system
• Create a ThreadCollector class with methods to add, remove, and retrieve threads

• Implement a data structure like a list or queue to store the threads

• Ensure thread safety by using synchronization mechanisms like locks or semaphores
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Q4. What is volatile?
Ans. 
Volatile refers to a type of memory storage that is temporary and can change frequently.
• Volatile memory loses its data when power is turned off, unlike non-volatile memory.

• Volatile memory is commonly used for temporary storage of data that needs to be quickly accessed and modified.

• Examples of volatile memory include RAM (Random Access Memory) in computers and cache memory in processors.
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Q5. Sql query to remove duplicates
Ans. 
Use the DISTINCT keyword in a SELECT statement to remove duplicates from a table.
• Use the SELECT DISTINCT statement to retrieve unique rows from a table.

• For example: SELECT DISTINCT column_name FROM table_name;

• Another way is to use the GROUP BY clause with the COUNT() function to remove duplicates.

• For example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name;
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Q1. Why do you think you are fit for this role?
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Q2. Why are you leaving your current company?
Ans. 
Seeking new challenges and opportunities for growth.
• Desire for new challenges and opportunities

• Looking for career advancement

• Seeking a more innovative and dynamic work environment
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