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

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Q121. Which category of services, Amazon Lambda belongs to ?

Amazon Web Services (AWS)

Ans. It's Serverless and PAAS ( Platform as a service )

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Q122. Which category of service , Amazon EC2 and S3 belongs to ?

Amazon Web Services (AWS)

Ans. They are IAAS ( Infrastructure as a service )

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Q123. Is Google App Engine , IAAS, PAAS or SAAS ?

Google Cloud Platform (GCP)

Ans. It's PAAS ( Platform as a service )

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Q124. What is the difference between Co Location, Virtualization and Serverless ?

Infrastructure

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Q125. How does cloud computing helps saves cost ?

Cloud Computing

Ans. Cloud computing helps saving overall cost for infrastructure and service usage through following -

1. On demand Services and elasticity - You only pay for what you use. Less Ideal time.

2. Resource Pooling

3. Self Service - Less involvement of human resources

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Q126. Can we pass the junit test if the tested method throws the exception ? and Should we do that ?

Junit

Ans. Yes, We can pass the test even if the tested method throws an exception.

One way is know as exception testing in which the tested method is expected to throw exception and hence the expectation is set accordingly.

@Test(expected = IndexOutOfBoundsException.class)
public void test(){}

Other way is to just ignore if the tested code throws an exception. In that case , we can enclose the tested method call in the try block and within exception block, we just return gracefully.

Exception testing is perfectly ok to be done as we would like test code in case an exception occurs and if the code is handling the exception properly. Ignoring the exception by putting the tested method call within try block isn't something normal and should be avoided.

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Q127. What is the use of defining equals , compareTo and hashcode methods in a class ? Where are they used ?

Core Java

Ans. equals, compareTo and hashcode are of use when the objects are used within collections.

Equals helps with collections that helps maintaining only unique objects ( like Set )

compare and compareTo helps with collections that helps maintaining objects in order ( TreeSet, TreeMap etc )

hascode helps with collections that facilitates hash searching ( like hashSet, hashMap etc )

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Q128. Develop an address form in React js.

React JS

^{This question was recently asked at 'PayPal'.This question is still unanswered. Can you please provide an answer.}

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Q129. CSS Box Model

CSS

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Q130. prototypal inheritance in Javascript

JavaScript

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Q131. Create a component and sort the data to show specific information.

React JS

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Q132. Have you had to work with memory leak problems in javascript ?

JavaScript

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Q133. Write a method to track every click on a page.

JavaScript

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Q134. What is the difference between inheritance in PHP vs. Javascript?

JavaScript

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Q135. Explain Identity management in GCP ?

Google Cloud Platform (GCP)

Ans. IAM is used to define the level of access to GCP services

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Q136. Explain Virtual machines in Google Cloud Platform.

Google Cloud Platform (GCP)

Ans. Virtual machines are IAAS in GCP which can called Compute Engine

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Q137. Can you explain integration between Spring and Hibernate ?

Hibernate

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Q138. What is the maximum limit of domain supported by Route 53 ?

Amazon Web Service (AWS)

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Q139. How can we create custom AMI ?

Amazon Web Service (AWS)

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Q140. Write a Program to draw a fish ?

Core Java

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Q141. Should we do anything to avoid memory leaks in Java ?

Core Java

Ans. Java has a intrinsic way of checking leaks and reclaiming memory called garbage collection. Moreover Java doesn't support pointer arithmetics , so there is very low comparative chance of memory leaks, compared to C,C++

Though there may be tools that may audit code to make sure that we are not leaving much for the garbage collection to work but I have never heard anyone doing anything for memory leaks in Java.

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Q142. Explain Collections in Java

Core Java

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Q143. Is String mutable or immutable in Java ?

Core Java

Ans. String is Immutable because of String Constant Pool.

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Q144. What are different types of Polymorphism in Java ?

Core Java

Ans. run time polymorphism
compile time polymorphism

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Q145. Can we assign the reference to this variable ?

Core Java

Ans. No

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Q146. Have you ever worked on migration from enterprise network infrastruscture to Cloud Infrastructure ? What problems did you face ?

Infrastructure

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Q147. Have you ever worked on Google Cloud Platform ?

Google Cloud Platform

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Q148. How do you mock private methods using Mockito ?

Mockito

Ans. We just declare the methods as protected and mark them with the annotation @visibleForTesting

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Q149. Can we mock private methods ?

PowerMock

Ans. Yes, using Power Mock.

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Q150. differences between drop , delete and truncate

Database

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