Explain the singleton, facade, or handle class design pattern?

Explain the singleton, facade, or handle class design
pattern?

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Explain the singleton, facade, or handle class design pattern?..

Answer / ash

Singleton - single instance of the class will be used. Many
uses.

facade - simplifying interface(s) into simple interface.
Used in application or presentation layer as api or for
wrapping external third-party api/resource

Handle - one method interface with one "action" argument.
Other arguments can be passed as list for "action". Used
when we dont know upfront which methods we would support and
dont want clients to recompile. Somewhat similar to command
pattern

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Explain the singleton, facade, or handle class design pattern?..

Answer / abere a .yimame

Design patterns are higher level abstractions that define
common software problems and solutions to these
problems.Their major importance: they enable software
developers to use best software practice , expertise and
reusablity of good experiance with out ever doing the same
problem agian and again.

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