Java class variable number
Driver d1 = new Driver("John", "01/01/1980");

List<Driver> drivers = new ArrayList<Driver>();
drivers.add(new Driver(..));
drivers.add(new Driver(..));

ArrayList<Driver> drivers = new ArrayList<Driver>();

Driver d1 = new Driver("John", "01/01/1980");
drivers.add(d1);

Driver[] drivers = {new Driver("John", "01/01/1980"),
                    new Driver("Smith", "02/02/1990")};

// or

Driver[] drivers = new Driver[2];
drivers[0] = new Driver("John", "01/01/1980");
drivers[1] = new Driver("Smith", "02/02/1990");

List<Driver> drivers = new ArrayList<Driver>();
drivers.add(new Driver("John", "01/01/1980"));
drivers.add(new Driver("Smith", "02/02/1990"));
// ...