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Q2161. How can we see running logs ?

Unix

Ans. tail -f <LOG_FILE_NAME>

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Q2162. 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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Q2163. How to see last 500 lines of a log or text file

Unix

Ans. tail -500 <FILE_NAME>

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Q2164. Can we run grep on zipped file ?

Unix

Ans. We can zgrep for that

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Q2165. How to find something within a folder and all it's sub folder

Unix

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Q2166. 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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Q2167. Have you ever used awk and sed ? What's the difference between the two ?

Unix

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Q2168. How to count lines in a file having a particular text

Unix

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

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Q2169. How can we create directories recursively

Unix

Ans. mkdir -p /home/newParentDir/newDir

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Q2170. 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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Q2171. 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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Q2172. What are the difference between Procedural and Object Oriented Programming languages ?

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Q2173. If compareTo() method returns zero, does it mean that the objects are always equal?

Core Java

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Q2174. Implement a thread-safe (blocking) queue

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Q2175. Write a program to implement a counting semaphore

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Q2176. Find all paths of length L in an acyclic graph

Algorithm

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Q2177. 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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Q2178. How would you write a socket in Java

Core Java

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Q2179. How would you implement low latency data structures ?

Data Structure

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Q2180. In a web application you notice freezes for several seconds during high load. What could be the most likely reasons? How would you troubleshoot them ?

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Q2181. Why do you think lambda expressions are considered such a big thing for Java 8?

Core Java

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Q2182. What are the drawbacks of creating immutable objects ? Why don't we create all object immutable if mutability possesses so much threat ?

Core Java

Ans. Immutable objects relieves us from the problems of inconsistencies and security and helps with better read performance but at the same time are write performance and storage overheads. In case any modification is required , a new object is created and thus creating multiple copies of it.

This is the reason we use StringBuffer / StringBuilder when we have to append some text multiple times and then create a String out of it.

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Q2183. Does immutability facilitates better performance ?

Core Java

Ans. Yes , but only the read performance in case we don't need to modify it much. In case we need to modify it a lot , it creates write performance overheads as we would need to create many news objects instead of just changing one.

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Q2184. Do you think that Recursion is expensive on computation ?

Core Java

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Q2185. What is Memoization ?

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Q2186. How do you fetch the records form database ?

Database

Ans. To fetch records from a database, you would use SELECT statements

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Q2187. Write a program to rotate array elements clockwise.

Core Java

Ans. class Rotate{

void leftRotate(int arr[], int d, int n)
{
for (int i = 0; i < d; i )
leftRotatebyOne(arr, n);
}

void leftRotatebyOne(int arr[], int n)
{
int i, temp;
temp = arr[0];
for (i = 0; i < n - 1; i )
arr[i] = arr[i 1];
arr[i] = temp;
}

void printArray(int arr[], int n)
{
for (int i = 0; i < n; i )
System.out.print(arr[i] " ");
}

public static void main(String[] args)
{
Rotate rotate = new Rotate();
int arr[] = { 1, 2, 3, 4, 5, 6, 7 };
rotate.leftRotate(arr, 2, 7);
rotate.printArray(arr, 7);
}
}

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Q2188. Given an array with number 1 to n, find the missing numbers.

Core Java

Ans. int main ()
{
int a []={1..n};
int miss=getMiss (a,n);
Printf ("%d",miss);
}
getMiss (int a [],int n){
int I,total;
total=(n 1)*(n 2);
for (i = 0; i < n; i++)
total -= a[i];
return total;
}

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Q2189. Write a program to find the 10th prime number.

Core Java

Ans. import java.util.Scanner;
public class Prime
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.print("Enter n to compute the nth prime number: ");
int nth = sc.nextInt();
int num, count, i;
num=1;
count=0;

while (count < nth){
num=num 1;
for (i = 2; i <= num; i )
{
if (num % i == 0)
{
break;
}
}
if ( i == num)
{
count = count 1;
}
}
System.out.println("Value of nth prime: " num);
}
}

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Q2190. Write a program to find length of String without using library function.

Core Java

Ans. Class lengofstring {
Public static void main(String[] arr) {
int i = 0;
String s = "hello world!";
for (char C: s.toCharArray()) i;
System.out.println("Length: "
i);
}
}

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