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Alibaba


   




Interview Questions and Answers for 'Alibaba' - 6 question(s) found - Order By Newest

 Q1. Which collection stores element in insertion order ?Core Java2018-01-10 09:48:36

Ans. LinkedList maintains the insertion order in collection.

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   Like         Discuss         Correct / Improve     collections     Asked in 1 Companies


 Q2. Difference between Factory and Strategy Design Pattern ?Design
Anonymous
Ans. Factory is a creational design pattern whereas Strategy is behavioral design pattern. Factory revolves around the creation of object at runtime whereas Strategy or Policy revolves around the decision at runtime.

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   Like         Discuss         Correct / Improve     java   design pattern   factory   strategy   creational design pattern   behavioral design pattern     Asked in 1 Companies      expert


Frequently asked in Alibaba (Based on 2 feedback)
 Q3. What is the best Memory setting for JVM ?Core Java2016-12-13 10:18:56

Ans. In Java JVM memory settings is done by use the arguments -Xms -Xmx. Use M or G after the numbers for indicating Megs and Gigs of bytes respectively. -Xms indicates the minimum and -Xmx the maximum.

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   Like         Discuss         Correct / Improve     jvm  memory management  jvm best memory setting     Asked in 1 Companies      intermediate


 Q4. Design an online shopping site system ?Design2016-12-13 11:06:10

Ans. AWS Services - CloudFront for distribution / caching, EC2 for computing, EBS for block storage , S3 for object storage , RDS for database , Kinesis for streaming , CloudWatch for monitoring.

Technologies - Java for back end with Spring Boot , Angular , RxJs for front end .

Architecture - Service Oriented. Multi layer.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q5. Difference between relational databases and NoSQL databases ?Database2016-12-13 11:06:42

Ans. https://www.mongodb.com/scale/nosql-vs-relational-databases

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   Like         Discuss         Correct / Improve     database management  nosql database  relational database     Asked in 1 Companies        frequent


 Q6. How would you process a 20 gb file with an application only having access to 4gb memory ?BigData2016-12-13 11:07:23

Ans. Load the file in chunks and then process. If we need to do analytic, we can process analytic information for those chunks and then reprocess the processed information from each chunk.

For example - we need to average all marks in the file. We can divide the file and load into 5 chunks and calculate average for each chunk. Then we can collect averages for all 5 chunks and then calculate the final average.

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   Like         Discuss         Correct / Improve     bigdata  processing big data     Asked in 1 Companies




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