public class PassByReference {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Customer c = new Customer();
		c.setNumber(5);
		System.out.println(c.getNumber()); // 5
		methodX(c);
		System.out.println(c.getNumber()); // ?
	}

	public static void methodX(Customer c2) {
		System.out.println(c2.getNumber()); // 5
		c2.setNumber(6);
		System.out.println(c2.getNumber()); // 6
	}
}