| Sno | Abstract Class | Interface |
| 1 | Can have implemented Methods | Cant |
| 2 | A class can inherit only one abstract class | A Class can implement any number of Interfaces. |
| 3 | We go for Abstract classes on such situations where we need to give common functionality for group of related classes | We go for Interface on such situations where we need to give common functionality for group of un-related classes |
| 4 | If you add a new method, then you can provide a default implementation and so no need to make any change to existing work. | If you add a new method, then you need to change all the existing work. |
| 5 | Static and Instance constants are possible. | Only Static constants are possible. |
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