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Programming Interface is an application program interface, while SPI is a service provider interface.
In JDK, it is described as follows:
· the API is the description of classes/interfaces/methods/... that you call and use to achieve a goal and
· the SPI is the description of classes/interfaces/methods/... that you extend and implement to achieve a goal
Relationship between API and SPI
Therefore, it is clear that API is an object that you can reference to achieve a certain goal. It clearly tells you what goal it can achieve, and users can plug and play; while SPI specifies that you must inherit or implement it to achieve a certain goal, and it is generally only used by some special-purpose interface developers (of course, some companies or individuals can also inherit or implement SPI to complete specific functions).
Sometimes, API and SPI are indistinguishable, such as Connection interface, Driver interface, etc.
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