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package types.point4;
import java.awt.Color;
interface Colored {
Color getColor();
}
interface Point {
double getX();
double getY();
}
final class CartesianPoint implements Colored, Point {
/* ... */
}
final class PolarPoint implements Colored, Point {
/* ... */
}
public class Main {
private Main() {}
public static void main(String[] args) {
CartesianPoint p1 = new CartesianPoint(0,0,Color.RED);
CartesianPoint q1 = new CartesianPoint(1,1,Color.BLUE);
PolarPoint r1 = new PolarPoint(0,0,Color.RED);
Point p2 = p1;
Point q2 = q1;
Point r2 = r1;
Colored p3 = p1;
Colored q3 = q1;
Colored r3 = r1;
}
}
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