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Abstract classes vs Interfaces: main differences
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JavaFAQ Home » General Java
Although interfaces and abstract classes are very similar, there are significant differences between them.
| Interfaces |
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Multiple inheritance |
Implementations allowed |
Static inner classes |
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Abstract Classes
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Single inheritance |
Implementations not allowed |
Static and non-static inner classes |
Interfaces can not be easily modified. Example: a new method is added to an interface but not implemented in a client. A runtime error will occur when non existent method is called.
An abstract class lets to add new methods without breaking compatibility, just provide working implementation of those methods.
When I need to use an Abstract class?
If your API classes that can have more than one implementation from one given class I advise you to use abstract classes, not interfaces. It will be easier to get different implementations.
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