Role of Javascript in Apex Programming

I am new to salesforce and apex which is a core back end programming in this world class crm. Our company will be executing this CRM stuff soon. So I was confused about following queries, it would be great if anyone of you answer this:

1. Is it possible to run the Java code inside Salesforce (https://ift.tt/36jDIAt) , instead of Apex?
   
   
2. Is it possible to have packages in the Apex code so that I could enable the like wide classed together?...

Role of Javascript in Apex Programming

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