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

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Q151. What is XSS or Cross site scripting ?

Ans. XSS or cross site scripting is a javascript vulnerability in web applications. The easiest way to explain this is with a case when the user enters a script in the client side input fields and that input gets processed without getting validated. This leads to untrusted data getting saved and executed on the client side.

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Q152. Difference between indexing and partioning

Database

Ans. Creating an index creates a separate table. ... Indexes are used to speed the search of data within tables. Partitions provide segregation of the data at the hdfs level, creating sub-directories for each partition. Partitioning allows the number of files read and amount of data searched in a query to be limited

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Q153. serialization and deserialization of singleton class

Core Java

Ans. The problem with serialized singleton class is that whenever we deserialize it, it will create a new instance of the class. To overcome this scenario all we need to do is to provide the implementation of readResolve() method.

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Q154. Detect a loop in a linked list

Data Structure

Ans. Work with two pointers on the linked list - a slow pointer (increments by one node) and a fast pointer (increments by two nodes). If both of these pointers meet at the same node, then there is a cycle in the linked list. Otherwise, no cycle.

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Q155. What is the Main Advantage of the native Key Word?

Core Java

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Q156. What is @EnableSptringMVC ?

Spring

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Q157. How can you verify if there were interactions with a static method using PowerMock ?

PowerMock

Ans. We can use PowerMockito.verifyStatic for this purpose

PowerMockito.verifyStatic(VerificationModeFactory.times(1));
<Class_Name>.<static_method_name>;

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Q158. Explain hibernate associations.

Hibernate

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Q159. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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Q160. Difference between StoreModule.forRoot() and StoreModule.forFeature() ?

NgRx

Ans. forFeature is used for lazily registering reducers with the module.

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Q161. What is Entity in hibernate?

Hibernate

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Q162. Write a Program to Find the maximum sum of the sub array ?

Data Structure

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Q163. Isnt the use of HashTable and ConcurrentHashMap the same, i.e providing synchronized map collection ?

Core Java

Ans. Both provide the thread safety but the actual difference come when talk about performance. CHM gives best performance when no of writer threads are less in number.

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Q164. Which s/w is used for adhar card verification for amount transfer?

Ans. The Aadhaar enabled Payment System or AePS

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Q165. Is java fully platform independent ?

Core Java

Ans. yes, Java is a class-based and object-oriented programming language. It is a platform-independent language i.e. the compiled code can be run on any java supporting platform. It runs on the logic of “Write once, run anywhere”.

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Q166. Where to use interface and abstract class ?

Core Java

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Q167. 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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Q168. If arrays cannot be resized , Why is this code valid

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

Core Java

Ans. We are not resizing the first array here but assigning the reference strArray to a new Array with size 5.

So after line 2, We have 2 arrays in memory, one with size 2 and other with size 5 with strArray referring to second array with size 5.

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Q169. 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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Q170. 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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Q171. 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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Q172. 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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Q173. 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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Q174. Have you worked with Data Feeds ?

General

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Q175. Have you ever worked on migrating AWS services and databases from one account to another ?

Amazon Web Services (AWS)

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Q176. 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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Q177. How to run jar file using command prompt

Core Java

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Q178. Diff between Runtime.getRunTime().gc() and System.gc()

Core Java

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Q179. 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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Q180. 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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