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Terms I used:
INTEND - the method signature, including the return type, the name of the method, and the definition of the method arguments, if any.
IMPLEMENTATION - the method body, the codes between the {} after the INTEND, the behavior.
An abstract method only defines the INTEND with no IMPLMENTATION. Every derived class inherits such an abstract method must supply an implementation to fulfill that INTEND.
A virtual method has the INTEND and the implementation. The original implementation sometimes called default behavior. An empty method body (nothing but only {}) is NOT the same as no IMPLEMENTATION.
a derived class has the option to override the default implementation defined by a virtual method (to provide a new method body), or just to leave that default behavior as it is.
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Good question!!
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Are there any publications that address what is virtualization?
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What is the difference between association class and abstract class in software designing?
Association class is describing the relationship between classes. An abstract class is just 1 class, provides some abstraction behaviors that may be (but do not have to) derived, overridden from.
Which technology server virtualization logical separation?
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