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Q3181. What is the use of toString method ?

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Q3182. How multiple catch block works ?

Core Java

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Q3183. How does Garbage Collector work? What are the realizations of Garbage Collector.

Core Java

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Q3184. How to build applications and integrate with jenkins?

Jenkins

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Q3185. What is the O notation for the ArrayList and List? And which one would you choose to insert item in the middle?

Data Structure

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Q3186. How to sort an ArrayList of objects

Data Structure

Ans. Using Collections.sort()

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Q3187. Differentiate osi and tcp/ip models and describe them

Networking

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Q3188. what are system calls

Operating System

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Q3189. What is size of structure in c ?

C++

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Q3190. What are reference variables in c

C++

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Q3191. Explain memory allocation and deallocation.

C++

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Q3192. How many threads can access a concurrent hashmap when the hashcode is overridden and always returns a zero.

Data Structure

Ans. The impact of both cases (fixed hashcode or random hashcode for keys) will have same result and that is "unexpected behavior". The very basic need of hashcode in HashMap is to identify the bucket location where to put the key-value pair, and from where it has to be retrieved.

If the hashcode of key object changes every time, the exact location of key-value pair will be calculated different, every time. This way, one object stored in HashMap will be lost forever and there will be very minimum possibility to get it back from map.

For this same reason, key are suggested to be immutable, so that they return a unique and same hashcode each time requested on same key object.

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Q3193. Difference between Tomcat and IBM Websphere.

Server

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Q3194. All the meaningful words that can be formed from a phone keypad

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Q3195. What are the disadvantages of Maven ?

Maven

Ans. Maven requires installation in the working system and the Maven plug-in for the IDE.
If the Maven code for an existing dependency is unavailable, you cannot add that dependency using Maven itself.
Some sources claim that Maven is slow.

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Q3196. Write a program to find the intersection of four rectangles provided.

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Q3197. How to find if any employees address is null or not during Junit testing

JUnit

Ans. By using assertNotNull(employee_address)

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Q3198. How to find the duplicate elements in the list given

Ans. use collections.frequency() method to find out the frequency, if it is greater than 1 then it is a duplicate element.

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Q3199. Find the duplicate numbers and missing numbers in a given array of n numbers

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Q3200. FInd the longest palindrome in a given string

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Q3201. What are the scenarios you consider in code reviews

General

Ans. https://www.evoketechnologies.com/blog/code-review-checklist-perform-effective-code-reviews/

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Q3202. Why should we go for custom defined exceptions even if we have many exceptions provided already using throw keyword

Core Java

Ans. It gives us the liberty to throw the specific exceptions which are required and also we can control the handling of exceptions

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Q3203. What is a comparator ?

Core Java

Ans. Java Comparator compares two Java objects in a “compare(Object 01, Object 02)” format. Using configurable methods, Java Comparator can compare objects to return an integer based on a positive, equal or negative comparison

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Q3204. Explain life cycle of Spring Application ?

Spring

Ans. Instantiation by using:
InitializingBean callback interface.
Custom init() method from the bean configuration file.
Aware interfaces for distinct actions.
PostConstruct and PreDestroy annotations.
Destruction.
DisposableBean callback interface

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Q3205. How to make a collection thread safe?

Core Java

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Q3206. How to delete a node from linked list if u do not have head and only have a pointer to the element which has to be removed ?

Data Structure

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Q3207. What is string pool and what is the use of intern() function ?

Core Java

Ans. The Java String class intern() method returns the interned string. It returns the canonical representation of string.

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Q3208. What is Defer Parsing JavaScript ?

JavaScript

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Q3209. How do you test object construction or constructors using junit ?

Junit

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Q3210. What is Throwable ?

Core Java

Ans. Throwable in java is a class that is the superclass of all exceptions and errors which may occurs in java program.It extends obcect class.

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