| Interface | Abstract Class |
|---|---|
| Interface contains only abstract methods | Abstract class can contain abstract methods, concrete methods or both |
| Access Specifiers for methods in interface must be public | Except private, we can have any access specifier for methods in abstract class |
| Variables defined must be public, static, final | Except private variables can have any access specifiers |
| Multiple Inheritance in java is implemented using interface | We cannot achieve multiple inheritance using abstract class |
| To implement an interface, we use implements keyword | To create abstract class, we extend abstract class |
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