It is an open-ended question with many answers. In my view, Object

class is the most important class of Java programming language. It

is the root of all the classes in Java. It provides some very

important and fundamental methods.

https://www.tutorialspoint.com/what-is-the-importance-of-java-lang-class-in-java#:~:text=The%20java.,also%20provide%20methods%20like%20Class.