Help with JOptionPane

Hi guys!

Just wanted to know if anyone could help me.
I want to make a program (when used, the user gets 3 words, from a line, randomly from this location:

Code:

---

        public static void main(String[] args)
        {
                File file = new File("C:\\weapons.txt");
                try {

---

ive made a set of JOptionPane boxes that ticks up, so the user must write in "Weapons.txt" to gain access and so on. What i need help with, is how i can get further with my "String input 4":

I want the JOptionPane input window to show 3 types of weapons, (3 weapons from one line). Witch line is the line that shows in the JOptionPane box, thats randomly.

Example of lines in the .TXT:

AK47 AG3 MP5
AWP SIGS65 RWP8
etc etc etc
etc etc etc
etc etc etc

My window:

Code:

---

String input4 = JOptionPane.showInputDialog (null, input3, "Input", JOptionPane.QUESTION_MESSAGE);

---

So from here on, im stuck. How can i get my print from the .TXT file, in to the JOptionPane string (input 4), on a line?

If anyone understands what im talking about that is :)

i can mention that im making a quick test for my buddies in the weapon club :) so the program will eventually print out a score and so on. Correct answers, etc. :)