Answer 1

public abstract class Shape {
private Color color;

public Shape(Color color) {
this.color = color;
}

@Override
public String toString() {
return "color=" + color;
}

public abstract void draw();
}

public class Circle extends Shape {
private double r;

public Circle(Color color, double r) {
super(color);
this.r = r;
}

@Override
public String toString() {
return super.toString() + ", r=" + r;
}

@Override
public void draw() {
...
}
}