@Override
    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == hero1) {
            whoIsHero = "Crazy Dave";
        }
        if (e.getSource() == hero2) {
            whoIsHero = "Pea Shooter";
        }
        if (e.getSource() == hero3) {
            whoIsHero = "Ice Plant";
        }
        if (e.getSource() == easy) {
            easy.setSelected(true);
            hard.setSelected(false);
            zombieDifficultyEasy = true;
        }
        if (e.getSource() == hard) {
            easy.setSelected(false);
            hard.setSelected(true);
            zombieDifficultyEasy = false;
        }
    }