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Interview Questions and Answers for 'Api' - 56 question(s) found - Order By Rating

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 Q1. What are the different methods for the authentication of Google Compute Engine API ?Google Cloud Platform (GCP)2020-10-15 08:54:58

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


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   Like         Discuss         Correct / Improve     Google Compute Engine API  GCP Authentication


 Q2. What is the different between collection and Stream Api ?Core Java2020-01-30 09:23:49

Ans. data under collection are actually stored in memory so that they can be retrieved when needed whereas data in streams are not stored and hence we need to construct it again when needed.

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   Like         Discuss         Correct / Improve     collection classes  stream api  collection vs stream     Asked in 1 Companies


 Q3. Explain Hibernate caching mechanismHibernate2018-11-14 12:53:50

Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application.

In hibernate we have two levels of caching

First Level Cache [ or ] Session Cache
Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache

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   Like         Discuss         Correct / Improve          Asked in 23 Companies


 Q4. Write a java program to find the maximum profit in day tradingCore Java2018-08-06 14:51:27

 This question was recently asked at 'Capital One'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q5. What is Lock interface in Java Concurrency API ?Core Java2018-07-20 18:01:42

Ans. Lock interface provide more extensive locking. They allow more flexible structuring and may support multiple associated Condition objects.

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   Like         Discuss         Correct / Improve     concurrency api


 Q6. Can you explain the integration between API Gateway and Lambda if we wish to develop services using these tools.Amazon Web Services (AWS)2018-01-30 18:06:37

Ans. We can create API gateway and give the name of lambda function in order to be linked with lambda function, deploy the API and whenever request will be made from API it will directly be linked to lambda function to perform further process.

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   Like         Discuss         Correct / Improve     aws api gateway  aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda


 Q7. What is the difference between AWS Gateway API and Lambda ?Amazon Web Services (AWS)2018-01-30 18:04:58

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   Like         Discuss         Correct / Improve     AWS Lambda  AWS Gateway API


  Q8. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs
Core Java2017-06-13 08:25:45

Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features

1. Inheritance for Code Reuse
2. Abstraction for modularity, maintenance and agility
3. Encapsulation for security and protection
4. Polymorphism for flexibility and interfacing

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   Like         Discuss         Correct / Improve     oops  oops features     Asked in 258 Companies      basic        frequent


 Q9. Can we discover end points of Rest API without looking at the code ?Rest2017-05-05 08:40:31

Ans. Generally Rest services don't have any registry like we have WSDL is SOAP and hence don't have a way to know the end points without looking at either the url mapping in controller or client code. Some restful service publish WADL (Web Application Description Language) and hence clients can locate the service end points.

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 Q10. What is Amazon S3 ?Amazon Web Services (AWS)2017-02-16 11:17:48

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.

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


 Q11. Write a method / program that will determine if the parenthesis are balanced in a given string.Core Java2017-02-03 13:13:55

Ans. https://www.geeksforgeeks.org/check-for-balanced-parentheses-in-an-expression/

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   Like         Discuss         Correct / Improve     string  code  coding     Asked in 14 Companies


 Q12. Write a Program to find the missing integer in an array of consecutive numbers?Core Java2017-02-02 18:04:12

 This question was recently asked at 'Knight Capital'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q13. Write any sorting algorithm.Algorithm2017-01-25 13:41:50

Ans. https://javasearch.buggybread.com/InterviewQuestions/questionSearch.php?searchOption=label'

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   Like         Discuss         Correct / Improve     Algorithm  Sorting Algorithm     Asked in 4 Companies      basic        frequent


 Q14. What are the benefits of creating immutable objects ?Core Java2017-01-22 16:01:54

Ans. 1. Security and Safety - They can be shared across multiple threads as they are thread safe. Moreover, it protects then from bad state due to interception by the other code segment. One such problem due to mutability and access by alternate code segment could be the change of hash code and then the impact on its search with hash collections.

2. Reuse - In some cases they can be reused as only one copy would exist and hence it can be relied upon. For example - String Pool

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   Like         Discuss         Correct / Improve     immutable  immutability objects     Asked in 1 Companies      Intermediate        frequent


Usually asked to entry level software developers.
  Q15. Write a program to swap two variables without using thirdCore Java2017-01-19 15:38:34

Ans. public static void main(String[] args) {
   int num1 = 1;   
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

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   Like         Discuss         Correct / Improve     code  coding     Asked in 37 Companies      basic        frequent


 Q16. Can we have multiple main methods in a single class ?Core Java2017-01-12 11:00:02

Ans. We can overload the main method by specifying different argument types. For example -

2 main methods with different arguments is perfectly legal

public static void main();
public static void main(String[] args);

The following are not legal as compiler will complain of duplicate methods

public static void main(String[] args);
public static void main(String[] args);

Even The following are not legal as we cannot overload on return types

public static String main(String[] args);
public static void main(String[] args);

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   Like         Discuss         Correct / Improve     main method     Asked in 2 Companies


 Q17. Can an application have multiple main methods within different classes ? If yes, How will the app decide which one to be executed ?Core Java2017-01-12 10:56:40

Ans. Yes we can have a main method with string[] argument in every class of an application. When we execute an app we specify the starting point i.e the class that will get the control first and hence main method of that class gets executed.

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   Like         Discuss         Correct / Improve     main method     Asked in 3 Companies


 Q18. What is a factory design pattern ?Design2017-01-09 13:21:43

Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object.

So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object.

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   Like         Discuss         Correct / Improve     design pattern  factory design pattern     Asked in 9 Companies


  Q19. What is database Normalization ?Database2017-01-09 12:00:02

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

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


Frequently asked in Accenture.
  Q20. What is your biggest achievement at work ?General2016-12-15 14:14:22

Ans. [Open Ended Answer]

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   Like         Discuss         Correct / Improve     general question  non technical question     Asked in 20 Companies        frequent


 Q21. What is Dirty read in Database Transactions ?Database2016-11-14 13:11:55

Ans. A dirty read occurs when a transaction is allowed to read data from a row that has been modified by another running transaction but not yet committed.

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   Like         Discuss         Correct / Improve     database transaction     Asked in 8 Companies


 Q22. What is a Test Dependency Scope in Maven ?Maven2016-11-14 10:51:53

Ans. This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases. This scope is not transitive.

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   Like         Discuss         Correct / Improve     maven     Asked in 2 Companies


Very frequently asked.
 Q23. What is the use of synchronized keyword ?Core Java2016-11-04 08:15:53

Ans. Synchronize is used to achieve mutual exclusion i.e at one time, the segment of the code, method that has been declared synchronized should be executed by single thread only and hence the lock needs to be retrieved before executing the segment and then released.

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   Like         Discuss         Correct / Improve     threads  multithreading  synchronized     Asked in 5 Companies      basic        frequent


 Q24. Write a Test Case using Mock ?Testing2016-11-04 08:13:38

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=mock&category=code

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   Like         Discuss         Correct / Improve     Junit  Mock     Asked in 1 Companies


Frequently asked to fresh graduates.
 Q25. What is ACID ?Database2016-11-04 08:09:44

Ans. ACID stands for Atomicity, Consistency, Isolation, Durability is a set of properties of database transactions.

Atomicity means all or nothing. i.e parts of a transaction shouldn't commit if any one of them fails. Either the whole transaction should succeed or it should be complete rollback.

Consistency means that any transaction should lead database from one stabe state to another.

Isolation means that the execution of transaction results in a system state that would be obtained if transactions were executed serially.

Durability means that when a transaction is committed it forms the permanent state of database.

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   Like         Discuss         Correct / Improve     database  acid     Asked in 7 Companies      Intermediate

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Frequently asked Design Pattern interview question.
 Q26. What is a prototype design pattern ?Design2016-11-04 08:06:01

Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects.

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   Like         Discuss         Correct / Improve     design pattern  prototype design pattern  cloning     Asked in 11 Companies      intermediate


 Q27. What are the benefits of Enums ?Core Java2016-09-07 09:05:01

Ans. Enums in Java are used to declare predefined objects and then reuse them. they offer many benefits

1. Enum instance are type safe and thread safe.

2. Enum instances are singleton and hence reused.

3. If we use Enums with Switch , It makes sure that the passed argument is either of its instance and hence provides a safeguard.

4. If we use Enum with Sorted Collections we can sort the elements with a predefined priorities ( as per constant declaration in enum )

5. We can use Enum as a Factory by defining its constructor.

6. We can store related constant data within enum. For example - If we know the values for the map upfront, we can alternatively use an enum.

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   Like         Discuss         Correct / Improve          Asked in 6 Companies


 Q28. What is a classpath in Java ?Core Java2016-08-14 19:27:02

Ans. Classpath is the parameter for JVM to look for java classes ( .class files ) that are to be looad by class loader

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   Like         Discuss         Correct / Improve     classpath     Asked in 1 Companies      basic


 Q29. What are some alternates to keeping Audit Tables ?Database2016-07-14 14:24:37

Ans. Audit Tables generally stores Raw information to be reviewed in case of problems or determining impact. If Database space is an issue , and the audit information is rarely retrieved, one design could be to use compressed file system.

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   Like         Discuss         Correct / Improve     databases   audit tables   raw transaction information storage     Asked in 1 Companies


Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback )
  Q30. Difference between == and .equals() ?Core Java
Anonymous
Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object.

Sample code:

String x = new String("str");
String y = new String("str");

System.out.println(x == y); // prints false
System.out.println(x.equals(y)); // prints true

  Sample Code for equals

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   Like         Discuss         Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator     Asked in 292 Companies      basic        frequent

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