Eight, the difference between the interface of the abstract class

One, the basic difference

1. Abstract classes allow the implementation of concrete idiom methods, while interfaces must have abstract methods and cannot have implementations.

2. A class can only inherit one abstract class, but it can implement multiple interfaces.

3. Abstract classes allow various types of member variables, while interface member variables are public static final.

4. Static code blocks and static methods are allowed in abstract classes, but interfaces do not.

5. The methods of abstract classes can be modified with public, protect, default, and private, while methods in interfaces only allow public.

Note:

jdk1.8 new features - interface

An interface can have static methods and default methods, which means that there are implemented methods in the interface.