private String modelName;

    private int modelYear;

    private String color;

    Car(String mn, int my, String c) {

        this.modelName = mn;

        this.modelYear = my;

        this.color = c;

    }

​

    public String getModel() {

        return this.modelYear + "식 " + this.modelName + " " + this.color;

    }

    public int compareTo(Car obj) {

        if (this.modelYear == obj.modelYear) {

            return 0;

        } else if(this.modelYear < obj.modelYear) {

            return -1;

        } else {

            return 1;

        }

    }

}

​

public class prog {

    public static void main(String[] args) {

        Car car01 = new Car("아반떼", 2016, "노란색");

        Car car02 = new Car("소나타", 2010, "흰색");

        System.out.println(car01.compareTo(car02));

    }

}