import java.awt.*;

// Target (main) class: Create the CUCSDrawing drawing window
public class CUCSGraphicsApplication {
    public static void main(String args[]) {
        CUCSDrawing d = new CUCSDrawing(new Face[] {
        new Face(), new Frown(), new ColoredFrown(Color.red) } );
    }
}

// Class Drawing: a simple graphics window that draws a list faces of Faces
public class CUCSDrawing extends Frame {
    Face[] faces;

    CUCSDrawing(Face[] f) {
        super(); // <-- if not present, would be automatically called anyway:
        // MUST initialize fields of superclass
        // Reminder: if a superclass' constructor is called, it must be
        // called at the very START of the subclass' constructor.
        faces = f;
        resize(350,150);
        move(0,75);
        setTitle("Drawing");
        show();
        toFront();
    }

    public void paint(Graphics g) {
        g.setColor(Color.black);
        g.translate(0, getInsets().top);
        for (int i = 0; i < faces.length; i++) {
            faces[i].paint(g);
            g.translate(110,0);
        }
    }
}

// class Face: a face with eyes and a mouth
public class Face {
    public void drawEyes(Graphics g) {
        g.fillOval(20,20,10,10);
        g.fillOval(70,20,10,10);
    }

    public void drawMouth(Graphics g) {
        g.drawLine(30,70,70,70);
    }

    public void paint(Graphics g) {
        g.drawOval(0,0,100,100);
        drawEyes(g);
        drawMouth(g);
    }
}

// a Face with a frowning mouth
public class Frown extends Face {
    // no constructor: new Frown () automatically uses Face()
    public void drawMouth(Graphics g) {
    g.drawLine(20,80,40,70);
    g.drawLine(40,70,60,70);
    g.drawLine(60,70,80,80);
    }
}

// a Frown whose eyes can be colored
public class ColoredFrown extends Frown {
    Color eyeColor;
    ColoredFrown(Color eye) {
        // note: Frown() is automatically called!
        eyeColor = eye;
    }

    public void drawEyes(Graphics g) {
        Color savedColor = g.getColor();
        g.setColor(eyeColor);
        super.drawEyes(g);
        g.setColor(savedColor);
    }
}

// illustrative example
public class Oops extends ColoredFrown {
    // MUST define a constructor that takes 1 or more arguments:
    // otherwise the default constructor Oops() will
    // try to automatically call ColoredFrown(), which DOES NOT EXIST!
}