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Q2151. Why String is a class in 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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Q2171. What is Web Server and explain its types?

Server

Ans. A program that uses HTTP for serving files that create web pages for users in response to their requests that are sent by the HTTP clients of their computer is called as a web server.

Web - Server Types

Apache HTTP Server by the Apache Software Foundation
Internet Information Service from Microsoft
Sun Java System Web Server
Jigsaw Server.

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Q2172. Write code for serialization.

Core Java

Ans. // Java code for serialization and deserialization
// of a Java object
import java.io.*;

class Demo implements java.io.Serializable
{
   public int a;
   public String b;

   // Default constructor
   public Demo(int a, String b)
   {
      this.a = a;
      this.b = b;
   }

}

class Test
{
   public static void main(String[] args)
   {
      Demo object = new Demo(1, "geeksforgeeks");
      String filename = "file.ser";

      // Serialization
      try
      {
         //Saving of object in a file
         FileOutputStream file = new FileOutputStream(filename);
         ObjectOutputStream out = new ObjectOutputStream(file);

         // Method for serialization of object
         out.writeObject(object);

         out.close();
         file.close();

         System.out.println("Object has been serialized");

      }

      catch(IOException ex)
      {
         System.out.println("IOException is caught");
      }

      Demo object1 = null;

      // Deserialization
      try
      {
         // Reading the object from a file
         FileInputStream file = new FileInputStream(filename);
         ObjectInputStream in = new ObjectInputStream(file);

         // Method for deserialization of object
         object1 = (Demo)in.readObject();

         in.close();
         file.close();

         System.out.println("Object has been deserialized ");
         System.out.println("a = " object1.a);
         System.out.println("b = " object1.b);
      }

      catch(IOException ex)
      {
         System.out.println("IOException is caught");
      }

      catch(ClassNotFoundException ex)
      {
         System.out.println("ClassNotFoundException is caught");
      }

   }
}

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Q2173. What are the difference between Procedural and Object Oriented Programming languages ?

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Q2174. If compareTo() method returns zero, does it mean that the objects are always equal?

Core Java

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Q2175. Implement a thread-safe (blocking) queue

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Q2176. Write a program to implement a counting semaphore

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Q2177. Find all paths of length L in an acyclic graph

Algorithm

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Q2178. Write a method receiving a stream of integers, caching the last 10 min of data and returning a number if it's less than the current input

Core Java

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Q2179. How would you write a socket in Java

Core Java

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Q2180. How would you implement low latency data structures ?

Data Structure

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