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

Interview Questions and Answers - Order By Newest

Q421. How do you prefer to store money values in your application ?

Ans. At Application level we use either Double or BigDecimal , preferably BigDecimal. At Database level we use Number with decimal precision 3.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve data types}

Q422. Explain System.out.println ?

Core Java

Ans. System is a class within java.lang package that contains several useful class fields and methods. It cannot be instantiated and hence can use only statically.even in this case this has been used statically i.e with class name itself and without creating an instance.

out is the static reference of Printstream declared as following in the System Class -

public final static PrintStream out = null;

println is the method of PrintStream class.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve System class Streams Input Output println Asked in 1 Companies basic frequent}

Q423. Implement the following method ?

int findMax(int[] items)

Core Java

Ans. int findMax(int[] items){
   int maxNumber = 0;
   for(int x:items){
      if(x > maxNumber){
         maxNumber = x;
      }
   }

   return maxNumber;
}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve coding code find max number in an array Asked in 1 Companies}

Very Frequently asked to Senior Software Engineers or Developers.

Q424. Describe some of the Design Patterns you have used ?

Design

Ans. [Open Ended Answer]

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve design patterns Asked in 17 Companies intermediate frequent}

Q425. If everything is an object , Cant we declare every object as

Object obj = new String();

Core Java

Ans. Yes, we can do that. Compiler wont complain. But using object reference we can only access methods which have been defined for object class i.e clone(), equals(), hashCode(), toString() etc.

We cannot access methods defined in String class or in any class in hierarchy between String and Object.

For example - we cannot do obj.append("abc") as it will now give compile time error.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve object initialization object declaration runtime polymorphism object oriented programming (oops) oops concepts}

Q426. Which type of memory is cleaned / recovered by garbage collection - stack or heap ?

Core Java

Ans. Heap memory.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve memory management stack heap garbage collection Asked in 2 Companies}

Q427. Write a program to print all even numbers first and then all odd numbers till 100. For example the output should be
2
4
6
8
...... 100
and then
1
3
5
7
...... 99

using only 1 for loop ? Is it possible with just one loop ?

Core Java

Ans. Yes , It can be done using single for loop

public class BuggyBread{
public static void main (String args[]) {
   int x = 50;
   for(int i=1;i <= 100;i++){
      if(i<=50){
         System.out.println(i*2);
      } else {
         System.out.println(i-x);
         x = x - 1;
      }
   }
}
}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve code coding Asked in 1 Companies}

Q428. Given two files with list of words, write a program to show the common words in both files

Core Java

Ans. import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.io.*;
public class Common {
public static void main(String ar[])throws Exception
   {
      File f=new File("a.txt");
File f1=new File("x.java");
      System.out.println(f.exists());
FileInputStream fin = new FileInputStream(f);
      FileInputStream fin1 = new FileInputStream(f1);

      byte b[]=new byte[10000];
byte b1[]=new byte[10000];
fin.read(b);
fin1.read(b1);
String s1 = new String(b);
String s2 =new String(b1);

String words1[] = s1.trim().split(" ");
String words2[] = s2.trim().split(" ");
Listlist1 = new ArrayList<>(Arrays.asList(words1));
Listlist2 = new ArrayList<>(Arrays.asList(words2));
list1.retainAll(list2);
System.out.println(list1);
}
}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve file handling file io code coding Asked in 1 Companies}

Q429. What is the difference between for and foreach loop in java ? Which one should be used in which cases ?

Core Java

Ans. 1. for loop in java is used with a counter as following

for(int counter=0;counter < 50;counter++){
System.out.println(list.get(counter));
}

for iterating and printing the contents of a collection

whereas foreach loop can be specified directly without the use of counter

for(String str:list){
System.out.println(list.get(counter));
}

2. for Each loop syntax is more clean if we have to iterate over the elements of a collection and we need not keep track of the record count

3. For is preferred when we need loops without the usage of collections or Array of objects and entirely primitives are being used

4. for loop is preferred if we need to keep track of record count and have to perform some action of the basis of that. For example - If we have to print something after every 5 records, With for each loop in such case, we will have to keep a separate counter.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve loop for loop control statements loop statement foreach loop for vs foreach loop}

Q430. Does java supports operator overloading ?

Core Java

Ans. No

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve operator overloading Asked in 1 Companies basic}

Q431. What is database Normalization ?

Database

Ans. https://en.wikipedia.org/wiki/Database_normalization

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve normalization database Asked in 35 Companies intermediate frequent}

Q432. When is the situation when finally section won't execute ?

Core Java

Ans. If the process / app is abruptly killed or terminated.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve exception handling finally Asked in 2 Companies intermediate}

Try 1 Question(s) Test

Q433. What is the use of static keyword in Java ?

Core Java

Ans. static keyword is used to specify that the respective programming construct ( method , variable ) belongs to the class and not to its instance and is supposed to be shared by all instances of the class.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve static keyword Asked in 1 Companies basic frequent}

Q434. Explain various Searching and Sorting Algorithms ?

Algorithm

^{This question was recently asked at 'HeadStrong,ServiceNow'.This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Search Algorithm Sorting Algorithm Asked in 2 Companies basic frequent}

Q435. Is it a good practice to use Asterick(*) in import statement to load multiple packages with single import statement ?

Core Java

Ans. No, we should be lean in loading only packages which are required. Loading packages which are not being used result in memory overheads.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve import import packages Asked in 1 Companies}

Q436. What is a Servlet Filter ?

Java EE

Ans. It's an object that can intercept http request and response and hence we can take appropriate action on those requests.

There are different types of filters based on Specifications like

Authentication
Logging
Encryption
Tokenizing

etc

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve servlets servlet filters Asked in 3 Companies basic frequent}

Q437. Can we override wait() or notify() methods?

Core Java

Ans. wait and notify are declared final in object class and hence cannot be overridden.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve object class methods wait notify}

Q438. Write an algorithm / Java Program to show duplicates in an array of n elements?

Algorithm

Ans. int duplicateArray[] = { 1, 2, 2, 3, 4, 5, 6, 8, 9}
Set unique = new HashSet();
for (int i = 0; i < duplicateArray.length; i) {
if (unique.contains(duplicateArray[i])) {
System.out.println(duplicateArray[i]);
} else {
unique.add(duplicateArray[i]);
}
}

Complexity O(n) = nHashSet contains and add has O(n) = 1

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve coding code Asked in 2 Companies}

Q439. What is the difference between authentication and authorization ?

Authentication

Ans. Authentication is the process of verifying the identity and credentials of the user to authenticate him into the system.

whereas

Authorization is the process by which access to a segment , method or resource is determined.

Authorization is usually a step next to authentication.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve authentication authorization authentication vs authorization Asked in 9 Companies basic frequent}

Q440. Write a multi threaded Program that will simulate transferring of money across accounts ?

Core Java

^{This question was recently asked at 'Trustwave'.This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Asked in 1 Companies}

Q441. Write a Program to print factorial of a number using recursion

Core Java

Ans. public class BuggyBread {
public static void main(String args[]) {
System.out.println(factorial(5));
}

private static int factorial(int number){
if(number == 1){
return 1;
} else {
return number * factorial(number - 1);
}
}
}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve recursion Asked in 25 Companies}

Q442. What is a Webdriver ?

Testing

Ans. Selenium WebDriver is a tool for automating web application testing.It helps in replicating the manual tester behavior like keyboard entry, mouse events etc and then matching the output against the expected.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve selenium webdriver Asked in 37 Companies}

Q443. How would you do an object oriented design on animals in a zoo ?

Design

^{This question was recently asked at 'Booking.com,InterContinental Hotels,Caissa,Workday'.This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Asked in 4 Companies}

Q444. What access the variable gets if we don't provide any access specifier ?

Core Java

Ans. It gets the default access i.e package protected.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve access specifiers default Access specifier Basic}

Q445. What is Amazon S3 ?

Amazon Web Services (AWS)

Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve aws amazon s3 aws s3 aws storage amazon cloud storage amazon s3 Asked in 12 Companies}

Q446. Do you like Native SQL Apis like JDBC or JPA / Hibernate ?

Hibernate

^{This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve JDBC vs JPA JDBC vs Hibernate}

Q447. How Marker interfaces works internally ?

Core Java

^{This question was recently asked at 'GGK Technologies'.This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve marker interfaces interfaces Asked in 1 Companies expert rare}

Q448. Can we overload abstract methods ?

Core Java

Ans. Yes

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve overloading abstract methods overloading abstract methods}

Q449. What are the ways in which an application can maintain config variables ?

Ans. 1. Property files
2. config xml
3. Database

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve config property files}

Q450. What are the advantages of using methods in Java ?

Core Java

Ans. Likewise classes, methods also provide a way for code reuse and abstraction. Code is reused, clean and easy to understand if classified properly within classes and methods.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve methods functions advantages of methods in java}

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.