Interview Questions and Answers for 'L' | Search Interview Question

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Q1621. Have you ever used java.util.Objects class ?

Core Java

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

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Q1622. 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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Q1623. Why AWS is better than Azure ?

Cloud Computing

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Q1624. What is a reflexive equals contract ?

Core Java

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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Q1625. Explain Transitive equals contract.

Core Java

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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Q1626. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

General

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

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Q1627. Have you ever been in a situation where any of strength became a weakness in some other setting ?

General

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Q1628. What is your greatest fear ?

General

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Q1629. What sort of challenges do you enjoy ?

General

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Q1630. Create an event class in Java.

Core Java

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Q1631. How does multi threading improve performance ?

Core Java

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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Q1632. 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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Q1633. 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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Q1634. What are the different ways to avoid multi Threading related problems in Java ?

Core Java

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

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Q1635. What is context switching wrt Threads in Java?

Core 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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Q1636. What is an Atomic Operation ?

General

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

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Q1637. Why Concurrent Collection Classes are fail-fast in Java ?

Core Java

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Q1638. Does Java generate .class file for interfaces ?

Core Java

Ans. Yes

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Q1639. What is the difference between ArrayIndexOutOfBoundException and ArrayStoreException?

Core Java

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Q1640. Are arrays Thread Safe ?

Core Java

Ans. Yes

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Q1641. Difference between Arrays and LinkedList ?

Data Structure

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Q1642. What is the ideal situation / case for using heap sort ?

Algorithm

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Q1643. Given a max-heap represented as an array, Return the n th largest element without modifying the heap.

Algorithm

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Q1644. Can we make array volatile in Java ?

Core Java

Ans. Yes, you can make an array (both primitive and reference type array e.g. an int array and String array) volatile in Java but only changes to reference pointing to an array will be visible to all threads, not the whole array

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Q1645. Which Java version supports Interface Default methods ?

Core Java

Ans. Java 1.8 or Java 8

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Q1646. Tell something about Sleep method.

Core Java

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Q1647. What is the use of sql dialect ?

Hibernate

Ans. Dialect means "the variant of a language".

Similarly in case of SQL Dialect we specify what dialect of SQL to be generated keeping in mind of underlying database.

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Q1648. Which jar files need to be included for using Hibernate ?

Hibernate

Ans. hibernate-orm
hibernate-validator
hibernate-ogm
hibernate-search

or you can download hibernate core with all dependencies.

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Q1649. How to run jar file using command prompt

Core Java

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Q1650. Have you worked with Data Feeds ?

General

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