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- Interface can not be instantiated. Same way, you can not instantiate abstract class.
- That means you can not create object of interface or abstract class.
Interface | Abstract Class |
| We can use interface keyword to declare interface. | We can use abstract keyword to declare abstract class. |
| Interface can hold only abstract methods(without implementation). | Abstract class can hold abstract(without implementation) as well as non abstract methods. |
| Interface can be implemented using implements keyword. | Abstract class can be extended using extends keyword. |
| We can achieve multiple inheritance using interface as we can implement multiple interfaces to any class. | Abstract class doesn't support multiple inheritance as we can not extend more than one class. |
| Interface can not hold main method, static methods or constructor. | Abstract class can hold main method, static methods or constructor. |
| Also it can hold only static and final variables and mandatory to initialize them. | It can hold static, non static, final, non final variables and also it is not mandatory to initialize them. |
| We can achieve 100% abstraction using interface as all methods are abstract by default. It can not hold concrete methods. | We can achieve partial(0% to 100%) abstraction using abstract class as it can hold abstract as well concrete methods too. |
| When you add a new method in existing interface it breaks all its implementation and you need to provide an implementation in all clients which is not good. | By using abstract class you can provide default implementation in super class by creating concrete method. It is not required to provide its implementation in sub class. |
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