class Player {

	// fields - used to store data for instances of the class
	String userName = null;
	int age = 0;

	// constructors
	Player(String user) {
		this.userName = user;
	}	

	// overloading constructor
	Player(String user, int age) {
		this.userName = user;
		if (age >= 0) {
			this.age = age;
		}
	}

}