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

Interview Questions and Answers - Order By Newest

Q1631. 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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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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Q1651. What is your daily work schedule ?

General

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Q1652. Have you heard of volatile Table in Teradata ?

Teradata

Ans. If you create table with VOLATILE option, the life of the table will be only for the current session.
It will be automatically dropped by Teradata manager once session expires.

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Q1653. Is this array declaration correct ? If not , Why ?

String[] strArray = new String[];

Core Java

Ans. No, We haven't specified the size of array to be initialized.

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Q1654. Is this array initialization correct ? If Yes, What will be the size of array ?

String[] strArray = new String[]{"Buggy","Bread"};

Core Java

Ans. Yes, size of the array will be 2.

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Q1655. Is this array initialization correct ? If Yes, What will be the size of array ?

String[] strArray = new String[3]{"Buggy","Bread"};

Core Java

Ans. No. It will result in error saying "Cannot define dimension expressions when an array initializer is provided"

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Q1656. Is this code valid

String[] strArray = new String[2];
strArray.length = 5;

Core Java

Ans. It will give compile time error saying "The final field array.length cannot be assigned"

Arrays once initialized cannot be resized.

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Q1657. Do you think it's a good practice to perform releases from a branch and then merge code to the master ?

SCM

Ans. We have followed this practice in one of the project. The only downside we felt was the need to merge the new snapshot version to master after the release.

The Benefit is that it's easy to just ignore the branch if complete rollback happens and hence master remains in sync with production.

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Q1658. Are you willing to spend long hours ?

General

Ans. why not if getting money in dollars!

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Q1659. What is TypeCasting ?

Core Java

Ans. Assigning a value of one type to a variable of another type is known as Type Casting.

Example :

int x = 10;
byte y = (byte)x;

In Java, type casting is classified into two types, Widening Casting(Implicit) widening-type-conversion and Narrowing Casting (Explicitly done) narrowing-type-conversion.

Widening or Automatic type converion - Automatic Type casting take place when,the two types are compatible and the target type is larger than the source type

Example :

public class Test {
public static void main(String[] args) {
int i = 100;
long l = i; //no explicit type casting required
float f = l;//no explicit type casting required
System.out.println("Int value " i);
System.out.println("Long value " l);
System.out.println("Float value " f);
}
}

Narrowing or Explicit type conversion - When you are assigning a larger type value to a variable of smaller type, then you need to perform explicit type casting.

Example :

public class Test{
public static void main(String[] args) {
double d = 100.04;
long l = (long)d; //explicit type casting required
int i = (int)l;//explicit type casting required
System.out.println("Double value " d);
System.out.println("Long value " l);
System.out.println("Int value " i);
}
}

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Q1660. How do you usually choose which type of EC2 Instance you would like to Use ?

Amazon Web Services (AWS)

Ans. Depend on its pricing module

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