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Q2131. What is Overriding ?

Core Java

Ans. Overriding refers to the Methods with same name and parameters, such that the later over rides the former method.

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Q2132. What is abstraction ?

Core Java

Ans. The process of hiding the implementation details from the user and providing only functionality.

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Q2133. What is the difference between AWS Gateway API and Lambda ?

Amazon Web Services (AWS)

Ans. AWS API Gateway is the endpoint URI to get invoke. Whereas Lambda is the compute function being invoked from API Gateway or S3 or SNS

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Q2134. Can we build web services using AWS Lambda ?

Amazon Web Services (AWS)

Ans. We have to complement it to AWS Gateway API.

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Q2135. What are the benefits of using AWS Lambda over EC2 ?

Amazon Web Services (AWS)

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Q2136. Can we reserve resources in AWS Lambda just like we do for Ec2 instances ?

Amazon Web Services (AWS)

Ans. You can have reserved capacity with AWS Lambda. This guarantees that this number of concurrent Lambdas are always available for that function.

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Q2137. Can we modify a list while iterating it ?

Core Java

Ans. No,we cannot.I t will give concurrentModificationExceptin error. It can be resolved by using ConcurrentClasses like ConcurrentHashMap,CopyOnWriteArrayList,BlockingQueue etc which are fail-safe and wont give exception.

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Q2138. What are the characteristics of the object ?

Core Java

Ans. 1. State

Instance variable or member elements forms the object state.

2. Behavior

Member functions forms the object behavior

3. Identity

Every object has a unique identity within JVM through a unique Id.

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Q2139. What is a CNAME alias ?

Networking

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Q2140. How is RDBMS different from DBMS ?

Database

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Q2141. How can we make objects if the constructor is private ?

Core Java

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Q2142. Explain Binary Search

Algorithm

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Q2143. What is the use of second level cache in Hibernate ?

Hibernate

Ans. Second level cache is shared between sessions. Hibernate by default uses first level cache. Second level cache need to be configurd to use.
There are several second level cache e.g eh cache,jboss cache etc.

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Q2144. What are micro services ?

Web Service

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Q2145. What is the use of Log4j ?

Logging

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Q2146. What is the use of put() method in Restful webservices ?

Web Service

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Q2147. How to capture Screenshot when the testcases are failed?

Testing

Ans. Using Listeners

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Q2148. What is the use of @import annotation ?

Ans. @Import annotation in Spring allows you to load bean definitions from one or more another @Configuration files or Components. You might not want to configure all the beans in one configuration file.

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Q2149. How to consume services using Restful web services?

Web Service

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Q2150. Why String is a class in Java ?

Core Java

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Q2151. Describe SQL Joins

Database

Ans. Oracle having following types of joins these are also called 8i joins. There are:

1. Equi (or) Inner join
2. Non Equi join
3.Self join
4.Outer join

Oracle also support the 9i (or) ANSI standard joins.There are:

1.Inner join
2.Left outer join
3.Right outer join
4.Full outer join
5.Natural join

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Q2152. Write a Program to find number of lines , words and characters in a File.

Core Java

Ans. import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class FileUtility {

public static void main(String[] args) {
System.out.println(printFile("/home/userme/notes"));
}

private static int printFile(String filePath) {
int wordCount = 0;
try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
String line = null;
String[] wordsArray = null;

while ((line = br.readLine()) != null) {
wordsArray = line.split(" ");
wordCount = wordsArray.length;
}
} catch (IOException e) {
e.printStackTrace();
}
return wordCount;

}
}

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Q2153. Given a String with some Code, Write a Parser to have proper indentation.

Core Java

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Q2154. Implement a sparse matrix Java class with a constructor, set and get method.

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Q2155. How do you make instance of an abstract class ?

Core Java

Ans. By extending it to the derived class and thereby creating instance of derived class.

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Q2156. Explain how Mark & Sweep is implemented in garbage collection.

Core Java

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Q2157. Can the double checked locking fail on single processor system ?

Ans. There is no mapping of single ton with number of processor of the system. So double check locking will not fail depending on number of processor.

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Q2158. What Parameter we need to specify while creating sockets ?

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Q2159. How would you stop a Thread in java ?

Core Java

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Q2160. What is the difference between grep, zgrep and egrep ?

Unix

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