How do I specify values in a properties file so they can be retrieved using ResourceBundle#getStringArray?

Question

I am trying to use ResourceBundle#getStringArray to retrieve a String[] from a properties file. The description of this method in the documentation

Answer 1

public String[] getPropertyStringArray(PropertyResourceBundle bundle, String keyPrefix) {
    String[] result;
    Enumeration keys = bundle.getKeys();
    ArrayList temp = new ArrayList();

    for (Enumeration e = keys; keys.hasMoreElements();) {
        String key = e.nextElement();
        if (key.startsWith(keyPrefix)) {
            temp.add(key);
        }
    }
    result = new String[temp.size()];

    for (int i = 0; i < temp.size(); i++) {
        result[i] = bundle.getString(temp.get(i));
    }

    return result;
}