Dart abstract class variables

An abstract class can not be instantiated , which means you are not allowed to create an object of it. Abstract classes can only be extended; and the subclass must provide implementations for all of the abstract methods in its parent class.

An abstract class can not be instantiated , which means you are not allowed to create an object of it. Abstract classes can only be extended; and the subclass must provide implementations for all of the abstract methods in its parent class.

To make a method abstract, use a semicolon (;) instead of the method body.

To make a method abstract, use a semicolon (;) instead of the method body.

The only difference is that the classes we’re using as interfaces don’t have the abstract keyword so one() and two() must have a body (it’s empty, but it’s still there).

The only difference is that the classes we’re using as interfaces don’t have the abstract keyword so one() and two() must have a body (it’s empty, but it’s still there).