Interface may contain only abstract methods.why this statement is false

Question

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Answer 1

I think because of the word "may". It would mean that an Interface can have also non abstract methods. But an interface can have only abstract methods.
https://www.google.de/amp/s/www.geeksforgeeks.org/difference-between-abstract-class-and-interface-in-java/amp/

Answer 2

Java can have non abstract methods . They are default methods and static interface methods. I believe they were introduced in Java 8 or 9