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What is the difference between interfaces and abstract classes in Java?
Following are the notable differences between interface and abstract class in Java.
| Abstract Class | Interface |
|---|---|
| An abstract class may contain concrete method. | All the methods of an interface are abstract. |
| To use an abstract class, you need to inherit it. Provide body to (override) the abstract methods if there are any. | To use an interface you need to implement the interface and provide body to (override) all the abstract methods of it. |
| Members of an abstract class can be public, private, protected or default. | All the members of the interface are public by default. |
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