import java.util.ArrayList; import java.util.Collections; public class Main { static class Car implements Comparable<Car> { String brand; int year; Car(String brand, int year) { this.brand = brand; this.year = year; } public int compareTo(Car other) { return year - other.year; } public String toString() { return brand + " " + year; } } public static void main(String[] args) { ArrayList<Car> myCars = new ArrayList<Car>(); myCars.add(new Car("BMW", 1999)); myCars.add(new Car("Honda", 2006)); myCars.add(new Car("Ford", 1970)); Collections.sort(myCars); System.out.println(myCars); } }