[tim]

Let's create a mix method:

Code:

    public static String[] mix(String[] array){
        Vector<String> data = new Vector<String>();
        String[] result = new String[array.length];
        for (String string : array)
            data.add(string);
        int count = 0;
        while (data.size() > 0){
            int pos = (int)(Math.random() * (double)data.size());
            String next = data.get(pos);
            result[count++] = next;
            data.remove(pos);
        }
        return result;
    }

Use this method to mix the array before you use it:

Code:

questions = mix(questions);