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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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What is the use of static import ?
What is the range of the char type?
Is java jre still free?
hoe can u call a constructor of a private classs to other inherited claa??
Why local variables are stored in stack?
What is indexof?
What is the Vector class?
Why Java is called as purely platform independent..? Explain briefly..dont Give regular answers Explain with your own example..?
What is the size of string?
What is package protected in java?
Why can't you declare a class as protected?
What is difference between wait and notify in java?
Core Java 
