most important keywords in Java:

1. public: A keyword used to indicate that a method or variable can be accessed from anywhere.

2. private: A keyword used to indicate that a method or variable can only be accessed within the same class.

3. protected: A keyword used to indicate that a method or variable can be accessed within the same package or by a subclass in a different package.

4. static: A keyword used to indicate that a method or variable belongs to the class and not to any instance of the class.

5. final: A keyword used to indicate that a variable or method cannot be changed or overridden.

6. abstract: A keyword used to indicate that a method or class is incomplete and must be implemented by a subclass.

7. interface: A keyword used to define a collection of abstract methods and constants that can be implemented by a class.

8. class: A keyword used to define a blueprint for creating objects that contain variables and methods.

9. extends: A keyword used to create a subclass that inherits the properties and methods of the parent class.

10. implements: A keyword used to indicate that a class is implementing an interface and must provide implementation for all of its abstract methods.

11. this: A keyword used to refer to the current object.

12. super: A keyword used to refer to the parent class of the current object.

13. try, catch, finally: Keywords used to handle exceptions in Java.

14. void: A keyword used to indicate that a method does not return any value.

15. return: A keyword used to return a value from a method.