Programming Interview Questions

“write code for reaching to the nth name in a comma delimited string ; input is string having names and delimited by comma”

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“How do you implement a concurrent hash map?”

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“Write a function for mutliply(a,b), where a and b are both positive integers, but you can only use the + or - operators.”

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“Write the function nqueens(num_rows, num_cols, num_queens) -- where num_rows and num_cols is the size of an arbitrary chess board. Function returns "true" if there exists a way to place "num_queens" queens without any queen threatening any other queen, false if it isn't possible.

Efficiency is not a concern.”

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“Can you reverse the items in this linked list (in C)?”

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“write a simple code for reversing a single-connected linklist In C.”

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“What is a deadlock? Explain.

What is Spring framework?

HTTP is a stateless protocol. How is HttpSession implemented then?

What is String.intern()?

My Hashtable returns in constant time for most keys but for certain ones it takes a while. What is wrong?

Explain volatile keyword. Is volatile keyword thread-safe?

Explain a few design patterns.

Name a few methods from Object class and tell what do they do.

There is an integer array which only contains 1s, 2s and 3s. How will you sort it?

What value has UML added in your projects?

Java API says if you override equals method you should override hashCode too. Why?”

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“How does a garbage collection system work? How will you prevent an object from being garbage collected?

Write N-ary tree traversal code to search a node given a String key.

How many JVM instances does a tomcat server have? How would it handle multiple applications with different versions of same api (for instance log4j)?

Explain wait and notify.

Explain Generics.

What is the difference between a static class and a singleton class?

Why do you want to work for Netflix?”

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“The string "paypal is the faster, safer way to send money" is written in a
clockwise spiral pattern inside a square starting from the upper left
corner:
(you may want to display this pattern in a fixed font for better legibility).

    P A Y P A L
    F E R W A I
    A M O N Y S
    S D Y E T T
    R N E S O H
    E T S A F E

Then read line after line:
    PAYPALFERWAIAMONYSSDYETTRNESOHETSAFE

Write the code that will take a string, calculate the minimum square that
will contain it and return the converted string:

String convert(String text);

convert("paypalisthefastersaferwaytosendmoney") should return
"paypalferwaiamonyssdyettrnesohetsafe"”

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