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Interview Questions and Answers for 'Synechron' - 22 question(s) found - Order By Newest

Very frequently asked to Fresh graduates.
  Q1. What is the difference between Encapsulation and Abstraction?Core Java
Anonymous
Ans. 1.Abstraction solves the problem at design level while encapsulation solves the problem at implementation level

2.Abstraction is used for hiding the unwanted data and giving relevant data. while Encapsulation means hiding the code and data into a single unit to protect the data from outside world.

3. Abstraction lets you focus on what the object does instead of how it does it while Encapsulation means hiding the internal details or mechanics of how an object does something.

4.For example: Outer Look of a Television, like it has a display screen and channel buttons to change channel it explains Abstraction but Inner Implementation detail of a Television how CRT and Display Screen are connect with each other using different circuits , it explains Encapsulation.

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 Q2. There are two objects a and b with same hashcode. I am inserting these two objects inside a hashmap.

hMap.put(a,a);
hMap.put(b,b);

where a.hashCode()==b.hashCode()

Now tell me how many objects will be there inside the hashmap?
Core Java
Anonymous
Ans. There can be two different elements with the same hashcode. When two elements have the same hashcode then Java uses the equals to further differentation. So there can be one or two objects depending on the content of the objects.

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Very frequently asked. Usually asked in different variants like Diff between StringBuffer , String Builder ; Difference between StringBuilder and String class; Choice between these classes etc.
  Q3. What is the difference between StringBuffer and String class ?Core Java
Anonymous
Ans. A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.

The String class represents character strings. All string literals in Java programs, such as "abc" are constant and implemented as instances of this class; their values cannot be changed after they are created.

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Very frequently asked in phone and walk in interviews.
  Q4. What are Marker Interfaces ? Name few Java marker interfaces ?Core Java
Anonymous
Ans. These are the interfaces which have no declared methods.Serializable and cloneable are marker interfaces.

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Advanced level question. Recently asked in few Indian service companies ( Based on 3 inputs )
 Q5. What are various types of Class loaders used by JVM ?Core Java
Admin
info@buggybread.com
Ans. Bootstrap - Loads JDK internal classes, java.* packages.

Extensions - Loads jar files from JDK extensions directory - usually lib/ext directory of the JRE

System - Loads classes from system classpath.

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Very frequently asked in companies using SOA.
  Q6. What are RESTful Web Services ?Rest
Admin
info@buggybread.com
Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines -

1. http for client server communication,
2. XML / JSON as formatiing language ,
3. Simple URI as address for the services and,
4. stateless communication.

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Usually asked to experienced developers.
 Q7. What is a cyclic dependency ?Maven
Admin
info@buggybread.com
Ans. A has dependency of B, B has dependency of C and C has dependency of A,architecture,technical lead

With Maven 2 , came transitive dependency wherein in above scenario, C will acts as a dependency of A as if this dependency has been defined directly in A but the negative side is that if it leads to cyclic dependency , it creates problems.

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 Q8. How are classes loaded by JVM ?Core Java
Admin
info@buggybread.com
Ans. Class loaders are hierarchical. The very first class is specially loaded with the help of static main() method declared in your class. All the subsequently loaded classes are loaded by the classes, which are already loaded and running.

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  Q9. What is the use of HashCode in objects ?Core Java
Admin
info@buggybread.com
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc.

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 Q10. What is a ConcurrentHashMap ?Core Java
Admin
info@buggybread.com
Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap.

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Frequently asked in high end product companies. Frequently asked in Deloitte.
  Q11. How is Hashmap internally implemented in Java ?Core Java2016-12-06 08:49:37

Ans. https://www.quora.com/How-is-Hashmap-in-Java-implemented-internally-What-are-the-pros-and-cons-to-use-it-What-are-the-complexities-it-provides-for-insert-delete-and-lookup/answer/Anshudeep-Bajpai?srid=iwnK

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 Q12. What is a Servlet Filter ?Java EE2017-01-19 11:33:37

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

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 Q13. What are the ways to get the values from list ?Data Structure2018-01-04 09:42:21

Ans. list.get(index);

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   Like      Discuss      Correct / Improve     list     Synechron


 Q14. There are 8 balls, 7 weigh 100 gms, 1 is defective, there is a weighing scale, any number of balls can be measured at the same time. in how many attempts defective balls can be found out.Puzzle2018-11-14 12:48:23

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


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 Q15. Detect a loop in a linked listData Structure2018-11-14 12:48:43

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


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   Like      Discuss      Correct / Improve     linkedlist     Synechron


 Q16. serialization and deserialization of singleton classCore Java2018-11-14 12:48:59

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


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 Q17. Difference between indexing and partioningDatabase2018-11-14 12:49:17

 This question was recently asked at 'Synechron,FlyTxt,Zalando'.This question is still unanswered. Can you please provide an answer.


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 Q18. what is volatile and atomicCore Java2018-11-14 12:49:31

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


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 Q19. How many read and write operations are provided at the same time by ConcurrentHashMaps ?Core Java2018-11-14 12:49:48

Ans. ConcurrentHashMaps provide unlimited read operation fro multi threaded environment. For write operation only one thread can change value for particular segment of map.

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 Q20. in the following class:
class A {
void methoda(Object o) {
Sysout("Object");
}

void methoda(String s) {
Sysout("String");
}

public static void main(String []args) {
A a = new A();
a.methoda(null);
}
}

what will be printed?
Core Java2018-11-14 12:51:08

Ans. String

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 Q21. Explain Hibernate caching mechanismHibernate2018-11-14 12:53:50

 This question was recently asked at 'Infosys,Sabre,Sapient,HCL Technologies,Thomson Reuters,Capgemini,FINRA,abhra,Ephesoft,Ananth Technologies,Verizon,Azuga,UrbanPro,Indecomm Global Services,The Digital Group,mPHATEK systems,Cakesoft Technologies,GoldenSource Corporation,Synechron,Clear2Pay,Rigil,Azuga,GGK Technologies system'.This question is still unanswered. Can you please provide an answer.


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 Q22. Explain servlet lifecycleJava EE2018-11-15 09:09:38

 This question was recently asked at 'United Health Group (UHG) ,7thOnline.com,Sumerge,NexThoughts,OpenText,Synechron'.This question is still unanswered. Can you please provide an answer.


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