@Override    public String toString() {        return "Player{" +                "name='" + name + '\'' +                ", age='" + age + '\'' +                ", email='" + email + '\'' +                ", ff=" + ff +                '}';     }    public static void main(String[] args) throws InstantiationException, IllegalAccessException {         Player player = new Player();         player.age = "234";         player.name = "asd";         player.email = "qq";         player.ff = 34;         Player player2 = new Player();         BeanUtils.copyProperties(player, player2);         BeanUtils.copyProperties(player2, player);         System.out.println(player2.toString());         System.out.println(player.toString());     } }Player{name='null', age='null', email='null', ff=null}Player{name='asd', age='234', email='qq', ff=34}Process finished with exit code 0