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Q2601. Tell something about Sleep method.

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Q2602. 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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Q2603. 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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Q2604. Diff between Runtime.getRunTime().gc() and System.gc()

Core Java

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Q2605. How to run jar file using command prompt

Core Java

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Q2606. Can we call a static method using reference currently pointing to null.

Core Java

Ans. yes, we can.
exa: public class Java{
public static void main(String... args) {
JAva j= null;
j.greeting(); // call with null reference
}
public static void greeting() {
System.out.println("Hello World");
}
} // output: Hello World

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Q2607. Which memory segment holds the byte code ?

Core Java

Ans. Code Segment

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Q2608. Have you ever worked on migrating AWS services and databases from one account to another ?

Amazon Web Services (AWS)

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Q2609. Have you worked with Data Feeds ?

General

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Q2610. Do you know how can we export Redis data ?

Redis

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Q2611. What is your daily work schedule ?

General

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Q2612. 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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Q2613. 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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Q2614. 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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Q2615. 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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Q2616. 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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Q2617. What is the problem with this code

String[] strArray = new String[2];
strArray[0] = 5;

Core Java

Ans. We are trying to add an integer element to an array of String. Will give compile time error.

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Q2618. Will this give compile time error ?

Object[] strArray = new String[2];
strArray[0] = 5;

Core Java

Ans. No. But It will throw ArrayStoreException at runtime.

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Q2619. Have you ever had any problems while doing release builds within Jenkins ?

Jenkins

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Q2620. Have you ever had problems with SCM checkouts or tagging while doing release build in Maven ?

Maven

Ans. Yes Sometimes due to caching , conflicting tags , or incorrect scm info within pom.

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Q2621. Can we perform release with a branch other than Master ?

Ans. Yes

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Q2622. How do you branch your code within SCM ?

SCM

Ans. We keep a Working Branch , Release Branch and Master.

Working Branch is what we work on. We release from the release branch.

So the flow for merge is

Work Branch -> Release Branch -> Master

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Q2623. 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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Q2624. Find all files from a directory (including sub directories ) that could contain dates in a specific format.

Unix

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Q2625. Are you willing to spend long hours ?

General

Ans. why not if getting money in dollars!

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Q2626. In what terms Java is better language than c and c++ ?

Ans. Java manages pointers intrinsically and gives no control over pointer arithmetic to coders and hence saves the applications from many possible problems like dangling pointers and memory leaks.

Java is platform independent and hence any application can be run on any hardware with the suitable JVM without building it separately for different hardwares.

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Q2627. 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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Q2628. What is the biggest Design problem in Java ?

Core Java

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Q2629. What is Bastion host ?

Infrastructure

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Q2630. 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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