Java – how to add visual content to JPanel?

I have defined a class named stone to add graphic blocks to JPanel:

public class Stone {

    private int x,y;
    private Color color;

    private static final int radius = 18;

    Stone(Color color) {
        this.color = color;
    }

    public Stone(int x,int y,Color color) {
        this(color);
        this.x = x;
        this.y = y;
    }

    void draw(Graphics g) {
        g.setColor(color);

        g.fillOval(x - radius,y - radius,2 * radius,2 * radius);
    }

    void setX(int x) {
        this.x = x;
    }

    void setY(int y) {
        this.y = y;
    }
}

I want to draw them on JPanel Do I have to do this in the paint method of JPanel, or can I use the add method of JPanel?

Solution

A quick answer is that you should extend a JComponent (because you want to add it to JPanel) and override the paintcomponent method (because you want some custom object painting)