Given:

You want to obtain the Filechannel object on line 1.
Which code fragment will accomplish this?

Given:

What is the result?

Your organization makes mlib.jar available to your cloud customers. While working on a new feature for mlib.jar, you see that the customer visible method public void enableService(String hostName, String portNumber) executes this code fragment

and you see this grant is in the security policy file:

What security vulnerability does this expose to your cloud customer's code?

And the code fragment:

Which situation will occur on code fragment execution?

Given:

and
checkQuality(QUALITY.A);
and

Which code fragment can be inserted into the switch statement to print Best?