| Abstract-class | Interface |
|---|---|
| To avoid independence | For future enhancement |
| Can have abstract and non-abstract methods | Only abstract methods. Java 8 onwards it can have default and static methods also |
| Can have constructor | Not possible |
| Member of interface can be static | Not possible |
| Doesn't support multiple inheritance | Supports multiple inheritance |
| Can have final, non-final, static and non-static variables | Only static and final variables |
| Can provide the implementation of interface | It is not possible to provide the implementation of abstract class |
| Can extend another Java class and implement multiple Java interfaces | Not possible |
| Fast | Slow |
10 November 2020
Abstraction vs Interface
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