Why i have to learn different languages like java,pyth.,c,c++ and so on.why i can not learn only one language and master that?

Question

And why shouldn't i master only java if we get most of the job opportunity from learning java?
And what is the logic behind learning different languages explain.

Answer 1

Yes, we recommend you to master 1 first after that learn others.

Logic behind learning different language : Not every company uses Java, there is many company uses python, trio web + PHP and other things. By learning them, we can get more job opportunity.