Interview Questions and Answers for 'T' | Search Interview Question

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Q1811. What are the characteristics of the object ?

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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Q1812. What is a CNAME alias ?

Networking

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Q1813. How is RDBMS different from DBMS ?

Database

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Q1814. How can we make objects if the constructor is private ?

Core Java

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Q1815. Explain Binary Search

Algorithm

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Q1816. 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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Q1817. How to capture Screenshot when the testcases are failed?

Testing

Ans. Using Listeners

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Q1818. 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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Q1819. Why String is a class in Java ?

Core Java

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Q1820. 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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Q1821. 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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Q1822. 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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Q1823. What Parameter we need to specify while creating sockets ?

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Q1824. 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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Q1825. 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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Q1826. Find all paths of length L in an acyclic graph

Algorithm

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Q1827. How would you implement low latency data structures ?

Data Structure

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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. 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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Q1831. 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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Q1832. 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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Q1833. 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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Q1834. 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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Q1835. Write a custom exception.

Core Java

Ans. if you are creating your own exception is known as custom exception.

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Q1836. What is an exception ? What are the different types of exceptions ?

Core Java

Ans. An exception is an unwanted or unexpected event, which occurs during the execution of a program that is at run time, that disrupts the normal flow of the program?s instructions. these are different types arithmetic exceptions, class not found exception, interrupted exception, run time exception etc.

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Q1837. Is HttpServlet an abstract class ?

Java EE

Ans. Yes

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Q1838. Find minimum operations required to convert one string to another. Allowed operation :Insertion Deletion Replace, all operational costs are same.

Core Java

Ans. StringBuilder str = new StringBuilder("Pizza");
int size = str.length();
str = str.replace(size-1, size, "u");
System.out.println("After replace, str = " str); // prints Pizzu

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Q1839. Write code to read data from a file and write it to a file with 2 threads using the thread name content

Core Java

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Q1840. How to Create Cron Job in Hybris e-commerce suite

Hybris

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