Difference between abstract class and interface
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Answer Posted / ved prakash mishra
ABSTRACT CLASS:-An abstract class declares common attributes and behaviors of the various classes in a class hierarchy. An abstract class typically contains one or more abstract methods that subclasses must override if the subclasses are to be concrete. The instance variables and concrete methods of an abstract class are subject to the normal rules of inheritance.
Attempting to instantiate an object of an abstract class is a compilation error.
Failure to implement a superclass's abstract methods in a subclass is a compilation error unless the subclass is also declared abstract.
we can use abstract superclasses to declare variables that can hold references to objects of any concrete class derived from those abstract classes. Programs typically use such variables to manipulate subclass objects polymorphically. We also can use abstract superclass names to invoke static methods declared in those abstract superclasses.
interface:- A subclass can inherit "interface" or "implementation" from a superclass. Hierarchies designed for implementation inheritance tend to have their functionality high in the hierarchyeach new subclass inherits one or more methods that were implemented in a superclass, and the subclass uses the superclass implementations. Hierarchies designed for interface inheritance tend to have their functionality lower in the hierarchya superclass specifies one or more abstract methods that must be declared for each concrete class in the hierarchy, and the individual subclasses override these methods to provide subclass-specific implementations.
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