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Q2291. Design a class that find all files with SSN.

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Q2292. Describe inheritance and polymorphism and their importance for OOP.

Core Java

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Q2293. What is the difference between instantiation and initialization ?

Core Java

Ans. Instantiation is the process of reserving memory for the object

For ex -

List list = new ArrayList();

Initialization is the process of setting the default value for the object or default object construction.

List list = new ArrayList(set);

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Q2294. 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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Q2295. Difference between Arrays and LinkedList ?

Data Structure

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Q2296. How can we make sure that only one object of a class get's created ?

Design

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Q2297. Explain your experience working on UI ? Have you worked with JSF ?

General

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Q2298. Have you faced any problem integrating software / services with any of your partners or vendors ?

General

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Q2299. 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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Q2300. Have you ever faced challenged with your current work ?

general

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Q2301. 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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Q2302. Can we access elements at a particular index using LinkedList collection class ?

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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Q2303. 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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Q2304. Can you give an example of a Get and Post Request.

Web Service

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Q2305. Can you design a program that can identify if two shapes on x and y plane would intersect ?

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Q2306. How can we identify if we circle on a xy place would intersect ?

Ans. If the sum of their radius is greater than the shortest distance between them, then they will intersect.

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Q2307. How can we identify if two squares ( given their diagonal coordinates ) would intersect on xy plane ?

Ans. Using the diagonal coordinates we can easily calculate the other 2 coordinates using Pythagoras.

Any 2 rectangles or squares will intersect if any coordinate of one square would lie within the boundary of another one. A point x,y will be inside the square ( x1,y1;x2,y1;x1,y2;x2,y2 ) is x is between x1 and y2 and y is between y1 and y2.

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Q2308. Explain CAP Theorem.

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Q2309. Have you heard of Rest method Patch ?

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Q2310. Do you think we should have security Tokens in Url ?

Design

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Q2311. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q2312. What are the Messaging systems / technologies you have worked with ?

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Q2313. What are the different delivery policies in Apache Kafka ?

Apache Kafka

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

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Q2314. What is your role in current project ?

General

Ans. Possible Answer - Java Developer

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Q2315. Have you ever encoded the response before sending it back ?

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Q2316. 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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Q2317. Have you ever worked with single sign on ?

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Q2318. Can you explain JSON specification ?

JSON

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Q2319. Have you ever built an automation suite to test a cron job or command line application ?

Testing

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Q2320. How can we test invoking a command line application using Java code ?

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