package shapes;
import java.awt.Graphics;
public class Circle extends Shape {
private int x;
private int y;
private int radius;
public Circle(int x, int y, int radius)
{
this.x = x;
this.y = y;
this.radius = radius;
}
@Override
public void draw(Graphics g) {
g.drawOval(x-radius, y-radius, radius*2, radius*2);
}
}from the g.drawOval point, we find that it is an abstract method, and I don"t know where its implementation is. And the Graphics object as a parameter doesn"t know where it was generated.