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Q2191. Write a custom exception.

Core Java

Ans. if you are creating your own exception is known as custom exception.

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Q2192. What is an exception ? What are the different types of exceptions ?

Core Java

Ans. An exception is an unwanted or unexpected event, which occurs during the execution of a program that is at run time, that disrupts the normal flow of the program?s instructions. these are different types arithmetic exceptions, class not found exception, interrupted exception, run time exception etc.

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Q2193. Why use Java ?

Core Java

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Q2194. Is HttpServlet an abstract class ?

Java EE

Ans. Yes

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Q2195. Why do we need ConcurrentHashMap ?

Core Java

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Q2196. What is the default size of ArrayList ?

Core Java

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Q2197. Explain flow of MVC

Design

Ans. It is an architectural pattern that separates an application into three main logical components: the model, the view, and the controller. Each of these components are built to handle specific development aspects of an application

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Q2198. Find minimum operations required to convert one string to another. Allowed operation :Insertion Deletion Replace, all operational costs are same.

Core Java

Ans. StringBuilder str = new StringBuilder("Pizza");
int size = str.length();
str = str.replace(size-1, size, "u");
System.out.println("After replace, str = " str); // prints Pizzu

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Q2199. Write code to read data from a file and write it to a file with 2 threads using the thread name content

Core Java

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Q2200. Design an inventory management system.

Design

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Q2201. What is micro-benchmarking in Java?

Design

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Q2202. How to Create Cron Job in Hybris e-commerce suite

Hybris

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Q2203. What is the need for filters in Java Servlets ?

Java EE

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Q2204. What is the difference between Interfaces and Abstract Classes with respect to Java 8 ?

Core Java

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Q2205. Which of the OOP's feature - encapsulation or abstraction - is more important ?

Core Java

Ans. Encapsulation facilitates security by hiding data and logic whereas Abstraction simplifies organization of data and related logic.

As applications scale, both concepts are required for easy management and maintenance. Encapsulation for security and criss cross communication between objects / modules will make it vulnerable. and Abstraction for better organization that enables better understanding of application code and easy maintainability.

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Q2206. Which of the polymorphism type - static or runtime - is more important ?

Core Java

Ans. Method overloading / static polymorphism compared to method overriding / runtime polymorphism has very limited usage as it just opens up an alternate way of defining a different method with the same name.

Method Overriding on other hand opens up many other features like contracting , interfacing , pluging development and hence development of libraries and frameworks.

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Q2207. What is the reason that non-static method are not allowed to be referenced from a static context in Java?

Core Java

Ans. If we try to access an instance method from a static context , the compiler has no way to guess which instance method ( variable for which object ), you are referring to. Though, you can always access it using an object reference.

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Q2208. Which are the thread safe / synchronized / concurrent classes in java collections ?

Core Java

Ans. Stack
Properties
Vector
BlockingQueue
ConcurrentMap
ConcurrentNavigableMap

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Q2209. What are the differences between Intermediate and Terminal Operations in Java 8 streams?

Core Java

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Q2210. What is the difference between Collections.emptyList() and creating instance of a list ?

Core Java

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Q2211. Which are the classes that implement java.util.List interface ?

Core Java

Ans. ArrayList
LinkedList
Vector
Stack

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Q2212. Why do you think that Stack collection class implement List interface ?

Core Java

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Q2213. What is the there only one method declared in Runnable interface?

Core Java

Ans. The Runnable interface describes a class whose instances can be run as a thread. The interface itself is very simple, describing only one method ( run ) that is called automatically by Java when the thread is started. The Runnable interface is usually used in conjunction with the Thread class.

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Q2214. What are scrollable ResultSet?

Database

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Q2215. What is EL in JSP?

JSP

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Q2216. What is difference between Executor.submit() and Executer.execute() method ?

Core Java

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Q2217. Can you write critical section code for singleton design pattern ?

Design

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Q2218. What is difference between CyclicBarrier and CountDownLatch in Java ?

Core Java

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Q2219. What do you mean by synchronized Non Access Modifier?

Core Java

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Q2220. Name few classes of java.util.regex package ?

Core Java

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