Comments on Everything about Java Certifications: Doubts - Nitin Sharma

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1) a difference between abstract class and interfa...

2005-06-19T22:07:00.000-07:00

1) a difference between abstract class and interface..

a. Interfaces:
i. for implementing multi-level inheritance
ii. All members should be public
iii. Should not have any implementation.

b. Abstract Class:
i. For capturing general behaviour
ii. You can have partially implemented methods.
iii. You can have all access modifiers like private, public, protected

1)a difference between abstract class and interfac...

2005-04-28T05:06:00.000-07:00

1)a difference between abstract class and interface..

Interface is a sort of abstraction which does has not has any implementation. It is suitable for defining an abstraction for full functionality has to be declared.

As regarding abstract class, sometimes when we create a generalized class, (for example, a class called Figure) it is not possible to implement all its member methods. For example, we cannot implement the area() method in the Figure class. In such cases, it is left to the subclasses to implement such methods.

Also since java class can extend a single class, and can implement multiple interfaces. So this is a design decision whether to make a parent abstraction an interface or class.

2)can the wait() method of the threads be overridden?if so why?

No they can't since they are declared final.

3)what exactly is a reference.? eg:- Graphics g

A reference is a pointer to an object. Although java has no direct access to pointer but that's what exactally a reference is.