Abstract vs Interface (Java)
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I share my learnings here. Thanks for reading.
| Abstract | Interface | |
| Declaration keyword | abstract | interface |
| Objects can be created? | No | No |
| Contains Abstract and concrete methods? | Both | Only Abstract methods |
| Are any keywords required for methods? | Abstract methods required to mention abstract keyword | Not required |
| Contain any Constructors? | Yes | No |
| inheritance | An abstract class can extend only from other abstract class | Interfaces can extend only to other interfaces |
| number of inheritances possible | Only 1 | many |
| Types of modifiers can be used | final, non-final, static, non-static | final, static |