Abstract class | Interface |
1) Abstract class can have abstract and non-abstract methods. | Interface can have only abstract methods. From version Java 8, it can have default and static methods also. |
2) Abstract class doesn't support multiple inheritance. | Interface supports multiple inheritance. |
3) Abstract class can have final, non-final, static and non-static variables. | Interface has only static and final variables. |
4) Abstract class can provide the implementation of interface. | Interface can't provide the implementation of abstract class. |
5) The abstract keyword is used to declare abstract class. | The interface keyword is used to declare interface. |
6) An abstract class can extend another Java class and implement multiple Java interfaces. | An interface can extend another Java interface only. |
7) An abstract class can be extended using keyword "extends". | An interface can be implemented using keyword "implements". |
8) A Java abstract class can have class members like private, protected, etc. | Members of a Java interface are public by default. |
Abstract class achieves partial abstraction whereas interface achieves full abstraction.
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