Technical interview questions by company

R System :

1.       What are difference between data hiding and encapsulation?

2.       What are classloader and how they work in Java?

3.       How you can implement new class loader?(user defined)

4.       How you can create thread in java?

5.       Which one is better Thread class or runnable interface and why?

6.       What is DI in spring?

7.       What is synchronized block and synchronized method?

8.       How you can create or implement your own hashmap?

Sapient:

1.       How you can create your application which will create your application high performance?

2.       How an application be high scalable?

3.       There is category and product and many to many relationship is there between category and product? If discount is given on category then it would be applicable on all product and product can also contains own discount, final discount would be cat discount + product discount. How you can create schema so that less table structure would be affected?

Infogain :

1.       OOP concept.

2.       Difference between inheritance and polymorphism?

3.       Various component of WSDL?

4.       Thread priority and various stages of thread?

Hugh :

1.       One design shown and ask what is the flaws in this?

2.       Class level lock and object level lock in thread?

3.       If two method of a class is synchronized and two thread need to access separate method of this class object in same time? Can they be accessible?

4.       What is difference between RESTFUL web service and servlet GET method?

5.       Can we provide any type of security in REST FUL web service?

Inventum:

1.       How we can get synchronized hashmap?

2.       Can synchronized hashmap work similar hashtable?

3.       How we can verify that x value is available in hashmap keys?

4.       Tell me which part of wsdl contains the class definition?

5.       How you can motivate your team?

6.       If we need to read from DB and I need that if not able to read 20 sec then show the error page, other wise show the DB read data? How many thread needed, and why.

7.       How we can control transaction in hibernate? Two ways

8.       What is the difference between prototype and request scope in spring bean?

9.       How we can arrange bean loading sequence?