What is the difference between an abstract class and an interface in Java?

Point	Abstract class	Interface
Inheritance	A class extends only one	A class implements many
Fields	Any kind of fields	Only constants (public static final)
Constructors	Yes	No
Methods	Abstract and normal	Abstract, default, static and private
Use when	Related classes share code and state	Different classes share a behavior

A good rule: use an interface to say what something can do, and an abstract class to share code between closely related classes. See Abstract Classes and Interfaces.

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