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 a contract between a class and the outside world. When a class implements an interface, it promises to provide the behavior published by that interface. This section defines a simple interface and explains the necessary changes for any class that implements it.his lesson will introduce you to objects, classes, inheritance, interfaces, and packages. Each discussion focuses on how these concepts relate to the real world, while simultaneously providing an introduction to the syntax of the Java programming language.