This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
It is because, any Foo object is an instance of Foo.
Foo is an instance of Bar, because Foo extends Bar.
Foo is an instance of Face because Class Bar implements Face and Bar is a direct super-class of Foo, so Foo is an instance of Face as well.
Any class in Java is an instance of Object.