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Q3231. What are different types of Polymorphism in Java ?

Core Java

Ans. run time polymorphism
compile time polymorphism

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Q3232. Is String mutable or immutable in Java ?

Core Java

Ans. String is Immutable because of String Constant Pool.

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Q3233. Explain Collections in Java

Core Java

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

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Q3234. 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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Q3235. Write a Program to draw a fish ?

Core Java

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Q3236. How can we create custom AMI ?

Amazon Web Service (AWS)

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Q3237. What is the maximum limit of domain supported by Route 53 ?

Amazon Web Service (AWS)

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Q3238. Can you explain integration between Spring and Hibernate ?

Hibernate

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Q3239. 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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Q3240. 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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Q3241. Why would you use XML over JSON when using ajax ?

JSON

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Q3242. What is the difference between inheritance in PHP vs. Javascript?

JavaScript

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Q3243. Write a method to track every click on a page.

JavaScript

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Q3244. Have you had to work with memory leak problems in javascript ?

JavaScript

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Q3245. Create a component and sort the data to show specific information.

React JS

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Q3246. prototypal inheritance in Javascript

JavaScript

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Q3247. CSS Box Model

CSS

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Q3248. Develop an address form in React js.

React JS

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Q3249. Difference between Span and Div ?

Html

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Q3250. Can we check two html radio buttons together ?

Html

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Q3251. What is the advantage of moving text messages to a separate properties file , like message.properties instead of hard defining it on the html ?

Design

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Q3252. 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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Q3253. 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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Q3254. 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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Q3255. What is the difference between Co Location, Virtualization and Serverless ?

Infrastructure

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Q3256. Which category of service , Google Search and Drive belongs to ?

SAAS

Ans. They are SAAS ( Software as a Service )

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Q3257. 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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Q3258. 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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Q3259. What are the different types of Services GCP provides ?

Google Cloud Platform (GCP)

Ans. Compute
Network
Storage
Big Data
Machine Learning

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Q3260. What is the difference between Billing Alerts and Budget Quotas in GCP ?

Google Cloud Platform (GCP)

Ans. Alerts only let customer knows of any excessive usage whereas Quota restricts the usage beyond a certain point.

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