Why wait, notify and notifyAll is defined in Object Class and not on Thread class in Java?

Why wait, notify and notifyAll is declared in Object Class instead of Thread is a famous core java interview question which is asked during all levels of Java interview ranging from 2 years, 4years to quite senior level position on java development. The beauty of this question is that it reflects what does interviewee knows about the wait notify mechanism, how does it sees the whole wait and notify feature, and whether his understanding is not shallow on this topic. Like Why Multiple inheritances is not supported in Java or why String is final in java there could be multiple answers of why wait and notify is defined in Object class and everyone could justify their reason.  
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Why use Underscore in Numbers from Java? Underscore in Numeric Literals Example

JDK 1.7 release had introduced several useful features, despite most of them being syntactic sugar, there use can greatly improve readability and code quality. One such feature is the introduction of underscores in numeric literals . From Java 7 onwards you can write a long digit e.g. 10000000000 to a more readable 1 0_000_000_000 in your Java source code. One of the most important reasons for using an underscore in numeric literal is avoiding subtle mistakes that are hard to figure out by looking at code. It's hard to notice a missing zero or extra zero between 10000000000 and 1000000000 , than 10_000_000_000 and 1_000_000_000 .
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Coursera's TensorFlow: Advanced Techniques Specialization Review [2022]

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