I've been learning Java lately and had some great feedback from the previous threads (hangman and guess a number games). I was challenged by a user to try to get this code done, so I'm posting it here for further review. Basically my weakeast (among many) points are exception handling and proper documentation. What do you think about it? How would you improve it?

Code can be found also in GitHub

package app;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;

public class RandomWord {
private String fileName = "src/app/wordlist.txt";
List<String> lines = null;

public static void main(String[] args) {
    RandomWord randomWord = new RandomWord();
    randomWord.init();
}

private void init() {
    try {
        lines = Files.readAllLines(Paths.get(fileName),
                StandardCharsets.UTF_8);
    } catch (IOException e) {
        System.out.println("File can't be opened.");
    }

    int randomWordIndex = getRandomNumber(1, lines.size());
    System.out.println(lines.get(randomWordIndex));
}

/**
 * Returns a random number in the range of the specified min and max
 * parameters.
 * 
 * @param min
 *            the minimum value to return
 * @param max
 *            the maximum value to return
 * @return a random number between the specified range
 */
private int getRandomNumber(int min, int max) {
    return min + (int) (Math.random() * ((max - min) + 1));
}
}