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

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Q1471. How serialization breaks Singleton pattern ?

Ans. It's not serialization but de serialization that breaks purpose of singleton as new objects can be brought to life using the serialized object.

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Q1472. How Reflection can break any design pattern ?

Design

Ans. Using java reflection api, we can tweak into a class and modify it's runtime behavior and hence modify the pattern it might be using.

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Q1473. 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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Q1474. 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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Q1475. What is the advantage of BidDecimal over Double ?

Core Java

Ans. BigDecimal provides more precision as compared to double.

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Q1476. What does @VisibleForTesting annotation denotes ?

Testing

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Q1477. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q1478. 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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Q1479. How to assign a static or IP range to Lambda Function ?

Amazon Web Services (AWS)

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Q1480. What are different in memory data structures that are used in No Sql Database ?

NoSql Database

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Q1481. What are different types of No Sql Databases ?

NoSql

Ans. graph based
column based
document based

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Q1482. 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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Q1483. How are hash codes generated ?

Data Structure

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

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Q1484. Difference between Arrays and LinkedList ?

Data Structure

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Q1485. How can we make sure that only one object of a class get's created ?

Design

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Q1486. Explain your experience working on UI ? Have you worked with JSF ?

General

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Q1487. Have you faced any problem integrating software / services with any of your partners or vendors ?

General

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Q1488. 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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Q1489. Have you ever faced challenged with your current work ?

general

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Q1490. 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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Q1491. Can you give an example of a Get and Post Request.

Web Service

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Q1492. Can you design a program that can identify if two shapes on x and y plane would intersect ?

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Q1493. Explain CAP Theorem.

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Q1494. Have you heard of Rest method Patch ?

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Q1495. Do you think we should have security Tokens in Url ?

Design

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Q1496. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q1497. What are the Messaging systems / technologies you have worked with ?

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Q1498. What are the different delivery policies in Apache Kafka ?

Apache Kafka

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

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

Q1499. What is your role in current project ?

General

Ans. Possible Answer - Java Developer

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Q1500. Have you ever encoded the response before sending it back ?

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