How to get all the implementation classes of an interface in Java?

Asked Aug 17 '23 at 15:38

Active Aug 18 '23 at 19:52

Viewed 45 times

I am making a Java program. The version of JDK is 1.8. I need to let the user implement an interface, and the implemented method will be called automatically. However, I don’t know how to get the implementation class based on the interface.

I tried Java SPI, but the user needs to write file in resource. But I want to implement the interface without any operation.

Any suggestion is welcome.

edited Aug 18 '23 at 19:52

0andriy

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asked Aug 17 '23 at 15:38

DoDayum

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The answer is still SPI. Have the user provide a reference to the class. There are libraries that can make doing so trivial, such as google's `auto-service`. – Jorn Aug 17 '23 at 15:42
Are you using spring? – hermit Aug 17 '23 at 15:44
I can't confirm if the consumer is using spring – DoDayum Aug 25 '23 at 06:48

How to get all the implementation classes of an interface in Java?

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