package l42;

import java.util.Comparator;

public class CompareByYear implements Comparator<Car> {

	@Override
	public int compare(Car o1, Car o2) {
		if (o1==null && o2==null) return 0;
		if (o1==null) return -1;
		if (o2==null) return 1;
		return o1.year - o2.year;
	}

}