The mass of a star can be determined by studying a. the wavelength of light emitted by the star. b. the color of the star. c. the distance between the star and Earth. 21. ANS: C 22. ANS: A 23.
(May 2010) (Learn how and when to remove this template message) In computing, an interface is a shared boundary across which two separate components of a computer system exchange information. The exchange can be between software, computer hardware, peripheral devices, humans and combinations of these.
An interface is an abstract type that is used to specify a contract that should be implemented by classes, which implement that interface. The interface keyword is used to define an interface and Implements keyword is used for implementing an interface by a class (in Java programming language).