Java and JavaScript — Why and whats common parts they share

It much more than car and carpet ))

So The Answer is it a history

Js is a mix of

1. Scheme — lisp — functional scoping
2. Smalltalk self-evolution — Self — prototypes, objects, method borrowing, clojures, functions as a first-class
3. Java — Number, Date, syntax, hype, and name. And Java itself inherits a lot from Smalltalk but was not so limited in memory and go with classes and inheritance