I am trying to make battleship with Java and i am running into a few questions?

First i am having trouble with the AI, i know how i want it to work with a guess random method and certain parameters to follow if the guess is right, if wrong continue the same process. The real issue i am having with my AI is how it is supposed to place its pieces on the board at random with no over laps.

Second issue i am having is how to move each object, i was going to use a key listener but... wait i just figured it out nm on that one lol, but i am still having trouble making it so it is recognized like when they type in the coordinates they want to fire at how do i make it say direct hit...

Third this is mostly a cosmetic issue but still i want it to look nice, how do i import music and sound affects like i was thinking i would do it like

if (hit = true)

{

import music

}

but that import music thing was just logic i do not know what method to use in order to make that happen.