In the reskinned Java SE 8 docs, what is the difference between concrete and instance methods?

Question

New tabs have been added to the method summary. "Concrete" and "instance" suggest more or less the same thing to me. What is the difference?

Java SE 7:

Java SE 8:

Answer 1

          Static        Abstract        All Other
InstanceM   N               Y              Y
ConcreteM   Y               N              Y
All         Y               Y              Y

Answer 2

• A concrete method is a method that's not abstract.

• An instance method is a method that's not static.

(Therefore, all static methods are concrete methods but are not instance methods.)