# The following lists the interview questions from a big telecom company on december 2009
> JAVA -Senior level position
- What is the OOPS concepts? And list them
- What is polymorphism
- what is the functionalities added into java 1.5 (eg. generic e.t.c)
- What are the collection interfaces you know? and list them
- How generic applies to collection interfaces?
- Design pattern in depth.
- Garbage collection mechanism
- Exception handling
- Process flow of struts
- What are the files getting created in simple sign-in application in struts?
- difference b/w struts 2.0
- diff b/w inculde redirect and include directive
- How can write method in JSP
- what are the implicit objects
- Servlet life cycle.
- how can servlet communicate with the view layer
- how may servlet instance will create for 10 requests.
- What is hibernate
- How is the entire architecture for hibernate
- What is the difference between head and trunc?
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