Java doesn't support multiple inheritance but implicitly every class in java extends Object and allows one more [duplicate]

Answer 1

Not exactly.... You can inherit from one class at a time, but nothing prevent this class from having a parent itself.

Answer 2

No. You're allowed to extend only one class, but this class can itself extend another one. If you don't specify any superclass in the extends clause, you extend from Object directly. If you specify a class in the extends clause, you extend from this class, which extends its own superclass, etc., until Object.