Abstract Class Implements 2 Interfaces

When you want to design partial implementation you can go for abstract class. And a typical class implements interfaces not extends. When an abstract class implements an interface in the section on interfaces it was noted that a class that implements an interface must implement all of the interfaces methods.

A class can implement more than one interface while it can inherit from only one abstract class.

Abstract class implements 2 interfaces. The msdn library defines the interface like a pure abstract class. Example abstract class program. The classes which inheritimplement the interfaces must define. It is the responsibility of the first concrete class that has that abstract class as an ancestor to implement all of the methods in the interface.

Unfortunately they must all be compatible interfaces meaning that if two interfaces have a method with the same name and argument list they must also have the same return type and compatible exception specifications. It is possible however to define a class that does not implement all of the interfaces methods provided that the class is declared to be abstract. Sample code for interface and abstract class in java. Multiple interfaces can be implemented generally inherited at a time.

Interface method does not have a body. Any of the two that implement the interface must provide the definitions to members specified in the. Example interface interface animal public void animalsound. The abstract class cannot be instantiated.

Interface method does not have a body public void run. An interface contains only the signatures of methods properties events or indexers. Child class which extends the abstract class should implement all the abstract methods of the parent class or the child class should be declared as an abstract class. Of course a class can implement any number of interfaces as manoj knows.

An interface is a completely abstract class that is used to group related methods with empty bodies. An abstract class permits you to make functionality that subclasses can implement or override whereas an interface only permits you to state functionality but not to implement it. A class can extend only one abstract class while a class can implement multiple interfaces. In java an abstract class can implement an interface and not provide implementations of all of the interfaces methods.

It has no implementation of its own and can only be implemented by a class or a struct.