How to use JWT for authentication in apache jena through HttpOp.java?

Question

I want to use JWT for authentication purpose for information exchange. According to the JWT documentation documentation, I have to add a header with field Authorization : Bearer <token> .

But in apache jena in HttpOp.java which execHttpGet(...) method I have to execute and what values of parameters I have to pass and where this header value Authorization : Bearer <token> I have to put ?

Why HttpAuthenticator in parameter of executeHttpGet(...) if it is interface?

Please response in simple terms , I am not clear with HttpContext , HttpClient , HttpAuthenticator.