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Q271. What are Hooks in programming and Design Patterns ?

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Q272. If you are given choice to either load object eagerly or lazily , which one would you use in case of singleton pattern ?

Design

Ans. I would choose Eager as the cost for 1 additional object is too minute for any such consideration.

Eager Loading results in Faster access ( Object available at load time) at the cost of additional space.

Lazy loading results in space saving ( Object available at first use ) at the cost of access speed.

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Q273. What is your opinion about caching ?

Design

Ans. Caching is a mechanism that provides faster access but at the cost of additional space. Caching is good if we need faster access and if it takes extensive processing to come to a value which doesn't gets changed frequently.

Caching could be an overhead if we don't need fast access or if the processed value changes too frequently.

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Q274. What can be done to protect the application from DDOS attack ?

Security

Ans. We can set the max number of requests from a given IP or an IP range

We can set the time out so that a single request cannot hold on to resources for too long.

We can identify patterns ( like too many requests from single IP for single page ) and then block such requests.

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Q275. how to switch to the parent webpage?

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Q276. What is the programming language used to build Jenkins?

Jenkins

Ans. There is a diverse set of programming languages used in Jenkins, including but not limited to: Java, JavaScript, Groovy, Golang, Ruby, Shell scripts

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Q277. Difference between merge and update in hibernate

Hibernate

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Q278. Class and Object methods.

Core Java

Ans. class:- A class describe the contents of an object, an it describe the detail of data field called instance variable and defines the operations called method.

Object:-An object is an element of a class. Object have the behaviors of their class.

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Q279. How to get collections from a Stream

Core Java

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Q280. Explain switch and router

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Q281. What are the types of clouds in cloud computing ?

Cloud Computing

Ans. Private, Public, Hybrid, Community

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Q282. Can anonymous class implement interface and extend a class

Core Java

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Q283. What is ServerSocket in Java ?

Core Java

Ans. This class implements server sockets. A server socket waits for requests to come in over the network. It performs some operation based on that request, and then possibly returns a result to the requester.

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Q284. What are the distinguished qualities in Java that no other language possess ?

Core Java

Ans. Java is widely adopted as an enterprise standard technology across business domains and technical domains ( Web , Desktop , mobile , data science etc ) and has a vast ecosystem of frameworks and libraries.

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Q285. What is headless mode in Java ? Why is it used ?

Core Java

Ans. It’s a mode that can be used for creating Back end application without the front end UI.

The advantage is that it reduces the number of packages that needs to be loaded ( by ignoring ui packages )

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Q286. Write a code to detect the longest palindromic substring

Core Java

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Q287. How can an XSS attack harm a system ?

Security

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Q288. What are the ways we can get over XSS or cross site scripting vulnerability ?

Security

Ans. The counter measures of XSS are input validation and implementing a CSP (Content Security Policy).

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Q289. Explain the lifecycle methods of a Dojo widget.

Dojo

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Q290. Explain SOLID principles.

Design

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Q291. Explain Spring mvc.

Spring

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Q292. What is Queue ?

Data Structure

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Q293. Write a program to make a triangle of stars.

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Q294. If you are given a stack trace , what would you look for ?

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Q295. If you see a terrible code, Would you rewrite it. If yes , Why ?

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Q296. What would you do if your rest services aren't responding fast enough ?

Rest

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Q297. What kind of deployable is created for the angular project ?

Angular Js

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Q298. What is life cycle of cloud deployment process ?

Cloud Computing

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Q299. What is JUnitRunner ?

JUnit

Ans. A JUnit Runner is a class that extends JUnit’s abstract Runner class and it is responsible for running JUnit tests.

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Q300. What are the pros and cons of Lambda expressions ?

Core Java

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