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

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Q31. What is Throwable ?

Ans. Throwable in java is a class that is the superclass of all exceptions and errors which may occurs in java program.It extends obcect class.

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Q32. What is SNMP ?

Networking

Ans. SNMP or Simple Network Management protocol is an application layer protocol for exchanging management information between network devices.

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Q33. Explain switch and router

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

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Q34. What are the types of clouds in cloud computing ?

Cloud Computing

Ans. Private, Public, Hybrid, Community

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Q35. Can we override behavior of a collection class ? How ?

Core Java

Ans. Yes. We can do that.

1. We can create own own implementation class extending the collection class and then override the behavior method.

2. We can override the behavior at the time of instantiation of class as following

List<MyType> list = new ArrayList<MyType>() {
public boolean add(MyType mt) {
super.add(mt);
Collections.sort(list, comparator);
return true;
}
};

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Q36. Explain Rest architecture

Rest

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Q37. Can you share your experience with encoding and encryption ?

Encoding

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Q38. How would you handle clustering on multiple servers?

Server

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

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Q39. What are the mutable and immutable data types ?

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Q40. Can we use combination of two authentication mechanism in an application ? Narrate with an example.

Authentication

Ans. Yes We can use. Negotiate is a very good example with NTLM fallback mechanism over Kerberose.

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Q41. What are different ways a user can be authenticated other than username / password ?

Authentication

Ans. IP Authentication
IP Range Authentication
Certificates
Authentication Cards

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Q42. Have you ever worked on any project dealing with authentication and authorization ?

Authentication

Ans. Yes, I have worked on single sign on project.

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Q43. Difference between injection and auto wiring.

Spring

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Q44. SQL Questions.

Database

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

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Q45. Can you give me a use case where you utilized serialization in your project code?

Core Java

Ans. we use serialization when we send response to client in JSON format.(the process of converting model object into json is nothing but serialization

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Q46. Difference between Query param and path param ?

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Q47. Write SQL query to join 2 tables ?

SQL

Ans. Select * from table1 join Select * from table2

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Q48. Can you tell us a use case of reflection in java that you have applied ?

Design

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Q49. what is dispatcher servlet@componentScan use ?

Spring Framework

Ans. @ComponentScan in a Spring Application.

With Spring, we use the @ComponentScan annotation along with the @Configuration annotation to specify the packages that we want to be scanned. @ComponentScan without arguments tells Spring to scan the current package and all of its sub-packages.

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Q50. What is stereotype annotation ?

Spring

Ans. These annotations are used to create Spring beans automatically in the application context. The main stereotype annotation is @Component . @Controller: Which is used to create Spring beans at the controller layer. The stereotype annotations in spring are @Component, @Service, @Repository and @Controller

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Q51. What are different awt constructs ?

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Q52. What are the distributed caches ?

Server

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Q53. If we have a return statement inside the finally block, Then what will happen ?

Core Java

Ans. Returning from inside a finally block will cause exceptions to be lost. A return statement inside a finally block will cause any exception that might be thrown in the try block to be discarded.

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Q54. What is the concept of hibernate versioning ?

Hibernate

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Q55. What is cluster ?

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Q56. Difference between HashMap and Dictionary in Java ?

Core Java

Ans. HashMap implements the Map interface while the Dictionary does not.

HashMap was introduced after HashTable and Dictionary.

Dictionary is currently obsolete in java.

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Q57. difference between ArrayList and array ?

Core Java

Ans. ArrayList is a variable length collection class whereas arrays are fixed length primitive structure.

We can use generics with arraylist but not with arrays.

We can store primitive data types within arrays but can't with ArrayList. In ArrayList that needs to be converted to Wrapper objects.

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Q58. Is HashMap Synchronized ?

Core Java

Ans. No HashMap isn't synchronized. ConcurrentHashMap and Hashtable are synchronized.

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Q59. Explain CloneNotSupportedException ?

Core Java

Ans. If we do not mention, Cloneable Interface to the Class which we want to Clone then we get this exception, only if we try to clone an object

Like:
public class TestClone{
@Override
   protected Object clone() throws CloneNotSupportedException {
      return super.clone();
   }
}

In Main, You try to do:
TestClone clone = new TestClone();

      TestClone clone2 = (TestClone) clone.clone();

You will get CloneNotSupportedException.

Just add -> public class TestClone implements Cloneable {

and things are fixed.

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Q60. Explain when you would decide to use open authentication ?

Authentication

Ans. Google OAuth can be used when we want to grant the access of our google credentials to the service provider ( most likely a cloud-based mobile application) by using the option ' Login via Google'

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