what is abstract class in Java?
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What is the difference between an array and an array list?
can we create a instance for intwerface?
when,where and how to use abstract class and interface
What is multiple inheritance? Is it supported by java?
what is use of business objects?
Is it possible to declare abstract class as final?What happens if we do so?
Explain the difference between abstraction and encapsulation.
all are saying java doesn't support multiple inheritance but by default Object class is super class for all the user defined classes and we can extend atmost one class so each class can extend more than one class so java supports multiple inheritance?i am confused with this,pls any one explain me.
What is qualitative variable?
Is delete, next, main, exit or null keyword in java?
Nullpointer exception is a very common exception. Why is it not made as a checked exception?
when to use ArrayList and when to use HashMap in webApplication.