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Interfaces and Abstract Classes

The interface should be regarded as a contract between a service provider and its clients. An abstract class is a class that cannot be instantiated An abstract class must be implemented by a subclass. In Java, the interface is a type. Follow this format to write an interface: accessModifier interface interfaceName { } public interface Printable {          void print (Object o); } The Printable interface has a method, print. print is public even though there is no public keyword.