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Ans. Atomic operations are performed in a single unit of task without interference from other operations.

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Q813. What is context switching wrt Threads in Java?

Ans. Context Switching is the process of storing and restoring of CPU state so that Thread execution can be resumed from the same point at a later point of time.

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Q814. What are the different ways to avoid multi Threading related problems in Java ?

Ans. Synchronization,
Concurrent classes,
Volatile keyword,
Implementing concurrent Lock interface,
Immutable classes

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Q815. What is Thread scheduler ?

Operating System

Ans. Thread Scheduler is the Operating System service that allocates the CPU time to the available runnable threads.

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Q816. What is Time slicing with respect to Threads ?

Operating System

Ans. Time Slicing is the process to divide the available CPU time to the available runnable threads.

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Q817. How does multi threading improve performance ?

Ans. Every process in it's timeline require different resources. Utilization of resources can be optimized when they are shared among different processes or threads. When one thread is sleeping waiting for a peripheral to complete (e.g. a disk write, or a key press from the keyboard), other threads can continue using processor time and hence would lead to better usage of resources.

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Q818. Create an event class in Java.

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Q819. Which java version supports assertion ?

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Q820. How will you enable or disable assertion for a package during runtime ?

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Q821. What sort of challenges do you enjoy ?

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Q822. What is your greatest fear ?

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Q823. Have you ever been in a situation where any of strength became a weakness in some other setting ?

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Q824. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/

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Q825. Explain Transitive equals contract.

Ans. The equals contract is said to be transitive if

obj1.equals(obj2); and obj2(.equals(obj3)

then obj1.equals(obj3) also returns true.

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Q826. What is a reflexive equals contract ?

Ans. An equal contract is said to be reflexive is equality between 2 objects always returns to be true.

For example -

Object o1;
Object o2;

o1.equals(o2); // returns true
o2.equals(o1); //returns true

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Q827. Which java feature is used to convert primitive type to reference type ?

Ans. AutoBoxing

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Q828. Write code to create a folder if it doesn't exist.

Ans. File folder = new File(path);

if(!folder.exists()){
try {
folder.mkdir();

} catch (Exception e) {}
}

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Q829. Can Java be run on hardware with just the JVM and no OS ?

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Q830. Why AWS is better than Azure ?

Cloud Computing

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Q831. If a high CPU Usage happens everyday at a particular time, How would you go about fixing it ?

Server

Ans. We can provision more instances for that particular time slot.

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Q832. Why do we use getbytes in Java?

Ans. It is used to convert String into an array of bytes.

byte[] getBytes() - converts String into a byte array.

byte[] getBytes(Charset charset) - converts String to byte array, based on charset encoding.

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Q833. Have you ever used java.util.Objects class ?

Ans. Yes, We are using requireNonNull method for validating if the object is null.

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Q834. How to deal with double hop authentication issue?

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Q835. How did you use authentication in node.js ?

Node,js

Ans. Using JWT

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Q836. Have you ever worked with encrypted Tokens and How ?

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Q837. Between Encrypted Password authentication and IP Authentication , which one would you prefer and why ?

Ans. IP authentication is very restrictive, if IP changes for some reason then getting the new IP white listed on the server firewall could run your day pretty long. I would prefer encrypted password authentication cause it is not affected by IP changes and not limited to a white listed IP, I could use any different machine and get through authentication without any hassle.

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Q838. Explain OAuth.

Ans. OAuth is an open-standard authorization protocol or framework that describes how unrelated servers and services can safely allow authenticated access to their assets without actually sharing the initial, related, single logon credential. Like using Google or Facebook to login to something.

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Q839. How cookies helps by storing encrypted passwords ?

Ans. It helps user autofill password on the form where its presented for authentication

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Q840. Explain the use of Client certificates for authentication ?