private String modelName;

    private int modelYear;

    private String color;

    private int maxSpeed;

    Car(String modelName, int modelYear, String color, int maxSpeed) {

        this.modelName = modelName;

        this.modelYear = modelYear;

        this.color = color;

        this.maxSpeed = maxSpeed;

    }

    Car() {

        this("아반떼", 2016, "흰색", 200);

    }

    public String getModel() {

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

    }

}

​

public class prog {

    public static void main(String[] args) {

        Car car01 = new Car();

        Car car02 = new Car();

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

        car01 = car02;          // 두 참조 변수가 같은 주소를 가리킴.

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

    }

}