Interview Questions and Answers for 'Dell' | Search Interview Question

Interview Questions and Answers for 'Dell' - 8 question(s) found - Order By Rating

Q1. Which is the best collections for maintaining elements in an order ?

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Q2. What is an Interface ?

Core Java

Ans. The interface is a mechanism to achieve abstraction. Interfaces can have abstract methods and variables. It cannot have a method body.

Sample Code for interface

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Q3. Explain debugging

Process

^{This question was recently asked at 'Adella software'.This question is still unanswered. Can you please provide an answer.}

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_{Like Discuss Correct / Improve debug Asked in 1 Companies basic}

Q4. Solve the producer and consumer problem

Operating System

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_{Like Discuss Correct / Improve producer consumer problem multi-process synchronization problem Asked in 1 Companies}

Q5. What is the use of constructors in Java ?

Core Java

Ans. Constructors are used to initialize the state of an object. If there are no constructor , objects won't have any initialized state and hence it's elements may contain garbage values. If the memory were used as is, the behavior of the object would also be unpredictable.

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_{Like Discuss Correct / Improve constructor Asked in 5 Companies}

Advanced level question frequently asked in US based companies. Recently asked in EMC and Intuit.

Q6. Can you provide some implementation of a Dictionary having large number of words ?

Solution

Ans. Simplest implementation we can have is a List wherein we can place ordered words and hence can perform Binary Search.

Other implementation with better search performance is to use HashMap with key as first character of the word and value as a LinkedList.

Further level up, we can have linked Hashmaps like ,

hashmap {
a ( key ) -> hashmap (key-aa , value (hashmap(key-aaa,value)
b ( key ) -> hashmap (key-ba , value (hashmap(key-baa,value)
....................................................................................
z( key ) -> hashmap (key-za , value (hashmap(key-zaa,value)
}

upto n levels ( where n is the average size of the word in dictionary.

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_{Like Discuss Correct / Improve java collections hashmap binary search search algorithm advanced architecture data structure Asked in 6 Companies frequent}

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Very frequently asked if being interviewed for hibernate. Frequently asked in Tata Consultancy (TCS) and Overstock.com

Q7. Difference between load and get ?

Hibernate

Ans. If id doesnt exist in the DB load throws an exception whereas get returns null in that case.get makes the call to DB immediately whereas load makes the call to proxy.

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_{Like Discuss Correct / Improve hibernate Asked in 16 Companies basic frequent}

Frequently asked at Manhattan Associates ( Based on 2 feedback )

Q8. What is a Lambda Expression ? What's its use ?

Core Java

Ans. Its an anonymous method without any declaration.

Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code.

It promotes Developer productivity, Better Readable and Reliable code.

Sample Code for lambda

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