Interview Questions and Answers for 'T' | Search Interview Question

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Q811. Can you explain JSON specification ?

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Q812. Have you ever encoded the response before sending it back from the service? If Yes , Which encoding was used ?

Ans. In two different situations I used UTF-8 and Base 64 encodings.

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Q813. Have you ever encoded the response before sending it back ?

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Q814. What is your role in current project ?

General

Ans. Possible Answer - Java Developer

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Q815. What are the different delivery policies in Apache Kafka ?

Apache Kafka

Ans. Exactly once , At least once , At max once

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Q816. What are the Messaging systems / technologies you have worked with ?

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Q817. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q818. Do you think we should have security Tokens in Url ?

Design

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Q819. Have you heard of Rest method Patch ?

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Q820. Explain CAP Theorem.

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Q821. Can you design a program that can identify if two shapes on x and y plane would intersect ?

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Q822. Can you give an example of a Get and Post Request.

Web Service

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Q823. Can we access elements at a particular index using LinkedList collection class ?

Data Structure

Ans. Yes we can. But as the underlying structure of the collection class is double linked list, it will eventually have to traverse to the element linearlly and hence would result in bad performance.

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Q824. Which of the following - arrays or LinkedList allow elements to be accessed using index and how ?

Data Structure

Ans. Arrays allows elements to be accessed directly using the index.

As Array elements are stored in continuous memory locations it's very easy to find the memory address of any element using the formula as following

Memory Address of Array start or index 0 + ( Size of array element * Index )

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Q825. Can we capture the Request body within the interceptor or Filter and perform operations on it ?

Spring

Ans. Yes, But with interceptor it will remove the body from the request and then we will have to explicitly add the attributes to the session to forward it to the handler.

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Q826. Explain your experience working on UI ? Have you worked with JSF ?

General

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Q827. How can we make sure that only one object of a class get's created ?

Design

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Q828. Difference between Arrays and LinkedList ?

Data Structure

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Q829. Why do we need to close the Scanner ?

Core Java

Ans. For releasing input stream reference (System.in), you should close scanner.

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Q830. Describe inheritance and polymorphism and their importance for OOP.

Core Java

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Q831. Design a class that find all files with SSN.

Core Java

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Q832. How are hash codes generated ?

Data Structure

Ans. Use hashCode() which returns an integer value, generated by a hashing algorithm

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Q833. Write code to get count of every 5 letter word in a string using lambda expression

Core Java

Ans. String str = "I had been saying that he had been there";

Map<String,Long> countWords = Arrays.asList(str.split(" ")).stream().filter(p->p.length() = 5).collect(Collectors.groupingBy(p->p,Collectors.counting()));

System.out.println(countWords);

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Q834. How would you choose your favorite company name for e.g. three companies are given in radio buttons Infosys, TCS and Aricent. Do You need to loop trough all radio buttons and select your favorite company or can just get the selected value.

Javascript

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Q835. What are different in memory data structures that are used in No Sql Database ?

NoSql Database

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Q836. What should we do If we need to know the IP of the machine where Lambda function runs ?

Amazon Web Services (AWS)

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Q837. What does @VisibleForTesting annotation denotes ?

Testing

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Q838. What is the advantage of BidDecimal over Double ?

Core Java

Ans. BigDecimal provides more precision as compared to double.

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Q839. What will the following code return

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
Collectors.averagingDouble(ClassA::getElement2)));

Core Java

Ans. Map<DataType1,DataType2> where DataType1 is the data type of element1 ( returned by getelement1 method ) and DataType2 is the data type of element2 ( returned by getElement2 method )

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Q840. What are we doing here

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
Collectors.averagingDouble(ClassA::getelement2)));

Core Java

Ans. We are averaging elements of a collection by element1 grouped by element1

* list is the reference of collection
* element1 is the member element returned by getElement1 method of ClassA
* element2 is the member element returned by getElement2 method of ClassA

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