Question

Which design pattern provides a single class which provides simplified methods required by client and delegates call to those methods?

a. adapter pattern
b. builder pattern
c. facade pattern
d. prototype pattern

Answer 1

The correct answer is the Option C. Facade Pattern, which simplifies interactions with complex subsystems by providing a single class with easy-to-use methods, delegating system complexities to appropriate components.

Step-by-step explanation:

The correct answer is option c. Facade Pattern. The facade pattern is a structural design pattern widely used in object-oriented programming. It provides a simplified interface to a complex subsystem, effectively forming a higher-level interface that makes the subsystem easier to use for clients. The facade does not encapsulate the subsystem but rather delegates client calls to the appropriate components within the subsystem without exposing the complexities of the subsystem's internal workings to the client. This simplification helps to decouple the client's implementation from the complex subsystem, promoting ease of use and reducing dependencies.

For example, an operating system might provide a FileFacade class with simplified methods to open, read, and close files. The FileFacade would internally manage the more complex operations required to carry out these tasks, which could involve interactions with the file system, access permissions, buffering, and error handling.