Give some features of Interface?

In Java, some of the features of an interface include:

1. Abstract methods: Interfaces can only contain abstract method declarations, and they cannot contain method implementations.

2. No Constructors: Interfaces cannot contain constructor methods.

3. 100% abstraction: Interfaces are 100% abstract, which means that they only contain abstract methods and constants.

4. Multiple inheritance: Interfaces allow multiple inheritance, which means that a class can implement more than one interface.

5. Strong typing: Interfaces enforce strong typing, which means that variables declared as an interface type must only be assigned reference values that implement that interface.

6. Accessibility: Interface methods are public by default and cannot be declared as private or protected.

7. Constants: Interfaces can contain constant declarations, which are public, static, and final by default.

8. Marker interfaces: An interface that does not contain any methods or constants is known as a marker interface, such as Serializable, Cloneable, and Remote.