What is the difference between interface & abstract class?
devquora
Posted On: Jan 04, 2021
| Abstract class | Interface |
|---|---|
| (1) Abstract class can contain abstract and non-abstract methods that should be declared with the abstract keyword. | The interface should be declared with the interface keyword. It can contain only abstract methods. |
| (2) Abstract class doesn't support multiple inheritances. | The interfacesupports multiple inheritances. |
| (3) Abstract class can contain final, non-final, static, and non-static variables. | The interface contains only static and final variables. |
| (4) Abstract class can provide the implementation of the interface. | Interface can't provide the implementation of the abstract class. |
| (5) An abstract class can be extended by using the "extends" keyword. | An interface can be implemented by using the "implements" keyword. |
| (6)For instance, public abstract class Shape{ public abstract void draw(); } | Example: public interface Drawable{ void draw(); } |
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