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Q2141. How is RDBMS different from DBMS ?

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Q2142. How can we make objects if the constructor is private ?

Core Java

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Q2143. Explain Binary Search

Algorithm

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Q2144. 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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Q2145. What are micro services ?

Web Service

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Q2146. What is the use of Log4j ?

Logging

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Q2147. What is the use of put() method in Restful webservices ?

Web Service

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Q2148. How to capture Screenshot when the testcases are failed?

Testing

Ans. Using Listeners

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Q2149. 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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Q2150. How to consume services using Restful web services?

Web Service

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Q2151. Why String is a class in Java ?

Core Java

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Q2152. 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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Q2153. 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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Q2154. Given a String with some Code, Write a Parser to have proper indentation.

Core Java

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Q2155. Implement a sparse matrix Java class with a constructor, set and get method.

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Q2156. 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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Q2157. Explain how Mark & Sweep is implemented in garbage collection.

Core Java

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Q2158. 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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Q2159. What Parameter we need to specify while creating sockets ?

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Q2160. How would you stop a Thread in java ?

Core Java

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Q2161. What is the difference between grep, zgrep and egrep ?

Unix

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Q2162. How can we see running logs ?

Unix

Ans. tail -f <LOG_FILE_NAME>

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Q2163. What is the command to change file / folder permissions ? What command should we use if we would like to give most liberal position on the file ?

Unix

Ans. chmod is used to change permissions on file or folder.

chmod 777 <FILE/FOLDER NAME>

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Q2164. How to see last 500 lines of a log or text file

Unix

Ans. tail -500 <FILE_NAME>

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Q2165. Can we run grep on zipped file ?

Unix

Ans. We can zgrep for that

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Q2166. How to find something within a folder and all it's sub folder

Unix

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Q2167. How to find lines in a file containing a particular text and get those lines in a new file

Unix

Ans. grep "Some Text" EXISTING_FILE > NEW FILE

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Q2168. Have you ever used awk and sed ? What's the difference between the two ?

Unix

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Q2169. How to count lines in a file having a particular text

Unix

Ans. grep "Some Text" FILE | wc -l

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Q2170. How can we create directories recursively

Unix

Ans. mkdir -p /home/newParentDir/newDir

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