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what is polymorhism
what is inheritance?
what is Abstract n Interface?
what if two interfaces have same method and a concrete
class is implementing both the
interfaces. Will there be a compilation error?
What are mutable and immutable classes?
How can u make a class mutable?
when will u use dem ...explain with example?
what is overriding and overloading?
what is garbage collection?
what is Thread? how do dey communicate?
what are the different ways of implementing ?
have u used any messaging technologies?
what is synchronization?
what are some additions in java 1.5?
what are generics?
whst is advanced for loop?
what is finally block?
can u have a try in finally? yes!!
can u have a finally in finally?
how do you write junits?
when is a object eligible for garbage collection?explain?
a = null and b has ref to a will b be eligible to be
garbage collected?
sql questions like diff joins? how do dey work?
exception handling?
what is marker interface? what is the need??
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How will you invoke any external process in java?
Explain java coding standards for methods?
what is the purpose of class "Object" which is base class for all classes?
What classes of exceptions, thrown by a throw statement?
What is void data type?
What's the difference between comparison done by equals method and == operator?
Explain the importance of finally over return statement?
Why bytecode is called bytecode?
Explain different ways of creating a thread. Which one would you prefer and why?
Explain about collection interface in java?
Can we extend immutable class?
Can java inner class be static?
Core Java 
