Following are the important differences between an abstract class and a concrete class.
| Sr. No. | Key | Abstract Class | Concrete Class |
|---|---|---|---|
| 1 | Supported Methods | Both abstract and concrete methods can be found in an abstract class. | Only concrete methods are allowed in a concrete class. The class is abstract, even if it only has one abstract method. |
| 2 | Instantiation | The new keyword cannot be used to create an abstract class. | The concrete class can be instantiated using the new keyword. |
| 3 | Abstract method | Abstract methods may or may not exist in abstract classes. | There can’t be an abstract method for the concrete class. |
| 4 | Final | A final class cannot be declared for an abstract class. | It is possible to declare a concrete class to be final. |
| 5 | Keyword | The abstract keyword is used to declare a class. | The abstract keyword is not present in the declaration of a concrete class. |
| 6 | Inheritance | The extends keyword allows an abstract class to inherit another class and implement an interface. | Only an interface can be inherited by an interface. |
| 7 | Interface | An interface cannot be implemented solely by an abstract class. To be able to use the interface for instantiation, a child class is required. | It is simple to create an interface. |
Note: also read about the Regular class vs static nested class
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Staying up to the mark is what defines me. Hi all! I’m Rabecca Fatima a keen learner, great enthusiast, ready to take new challenges as stepping stones towards flying colors.
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