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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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Give a briefing on the life cycle of a thread.
What are the major advantages of internal iteration over external iteration?
Does java vector allow null?
Explain Global variables in Packages?
Why char array is preferred over string for storing password?
How does linkedlist work in java?
what is the purpose of class "Object" which is base class for all classes?
what is the use of abstract class?
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What are the types of inner classes (non-static nested class) used in java?
What are the drawbacks of reflection?
Is ++ operator thread-safe in java?
What is a Java Virtual Machine?
Core Java 
