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

Interview Questions and Answers - Order By Newest

Q1801. Can we modify a list while iterating it ?

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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Q1802. 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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Q1803. How is RDBMS different from DBMS ?

Database

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Q1804. How can we make objects if the constructor is private ?

Core Java

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Q1805. Explain Binary Search

Algorithm

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Q1806. 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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Q1807. What are micro services ?

Web Service

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Q1808. What is the use of Log4j ?

Logging

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Q1809. What is the use of put() method in Restful webservices ?

Web Service

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Q1810. How to consume services using Restful web services?

Web Service

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Q1811. Why String is a class in Java ?

Core Java

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Q1812. 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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Q1813. 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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Q1814. Given a String with some Code, Write a Parser to have proper indentation.

Core Java

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Q1815. 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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Q1816. Explain how Mark & Sweep is implemented in garbage collection.

Core Java

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Q1817. 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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Q1818. What Parameter we need to specify while creating sockets ?

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Q1819. How would you stop a Thread in java ?

Core Java

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Q1820. 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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Q1821. 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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Q1822. 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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Q1823. If compareTo() method returns zero, does it mean that the objects are always equal?

Core Java

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Q1824. 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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Q1825. How would you write a socket in Java

Core Java

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Q1826. How would you implement low latency data structures ?

Data Structure

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Q1827. Why do you think lambda expressions are considered such a big thing for Java 8?

Core Java

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Q1828. 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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Q1829. 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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Q1830. Do you think that Recursion is expensive on computation ?

Core Java

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