Design - Interview Questions and Answers for 'Amazon' | Search Interview Question

Design - Interview Questions and Answers for 'Amazon' - 2 question(s) found - Order By Newest

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.

Q1. Differences between abstract class and interface ?

Core Java

Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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Related Questions

What are the different uses of Interfaces in Java ?

Why can't we have diamond problem with interfaces ?

Why do we need Thread class even in case we execute thread using runnable interface ?

What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?

What are Marker Interfaces ? Name few Java marker interfaces ?

Can we declare interface methods as private ?

What is comparator interface used for ?

What is the use of runnable interface if we can always create a new thread using Thread class ?

Which of the following doesn't extend Collection interface ?

Q2. In a file there are 1 million words . Find 10 most frequent words in that file.

Design

Ans. step1: first read the file
text=file.read();
step2: then split the text into words
words=text.split();
step3: count the frequency of each words
wordcount=Counter(words);
step4: find the 10 most common words
mostCommonWords=wordcount.mostCommon(10);
return mostCommonWords;

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Related Questions

What is a stream and what are the types of Streams and classes of the Streams?

Name few File IO related classes and interfaces ?

Tell something about BufferedWriter ? What are flush() and close() used for ?

What is Scanner class used for ? when was it introduced in Java ?

What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?

Which is the abstract parent class of FileWriter ?

Which class is used to read streams of characters from a file?

Which class is used to read streams of raw bytes from a file?

Which is the Parent class of FileInputStream ?

Difference between Scanner and BufferedReader ? Which one is faster and Why ?

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