Esempio di uso dei componenti

import java.awt.*;
import java.applet.Applet;

class Figura extends Canvas {
    static public final int LINE = 0;
    static public final int RECT = 1;
    static public final int FILLRECT = 2;
    static public final int CLEARRECT = 3;
    static public final int THREEDRECT = 4;
    static public final int FILLTHREEDRECT = 5;
    static public final int ROUNDRECT = 6;
    static public final int FILLROUNDRECT = 7;
    static public final int OVAL = 8;
    static public final int FILLOVAL = 9;
    static public final int ARC = 10;
    static public final int FILLARC = 11;
    static public final int POLIGON = 12;
    static public final int FILLPOLIGON = 13;

    private int shape;

    Figura (int quale) {
        shape = quale;
    }

    public void paint (Graphics g) {
        Rectangle size = bounds ();
        setForeground (Color.white);
        setBackground (Color.lightGray);
        g.setColor (Color.black);
        switch (shape) {
            case LINE :
                g.drawLine (1,1,size.width - 2 ,size.height - 2);
                break;
            case RECT :
                g.drawRect (1,1,size.width - 3 ,size.height - 3);
                break;
            case  FILLRECT :
                g.fillRect (1,1,size.width - 3 ,size.height - 3);
                break;
            case  CLEARRECT :
                g.fillRect (0,0,size.width ,size.height);
                g.clearRect (size.width / 4 , size.height / 4 ,
                    size.width / 2  ,size.height / 2);
                break;
            case  THREEDRECT :
                g.draw3DRect (1,1,size.width - 3 ,size.height - 3, false);
                break;
            case  FILLTHREEDRECT :
                g.fill3DRect (1,1,size.width - 3 ,size.height - 3, true);
                break;
            case  ROUNDRECT :
                g.drawRoundRect (1,1,size.width - 3 ,size.height - 3, 10, 10);
                break;
            case  FILLROUNDRECT :
                g.fillRoundRect (1,1,size.width - 3 ,size.height - 3, 10, 10);
                break;
            case  OVAL :
                g.drawOval (1,1,size.width - 3 ,size.height - 3);
                break;
            case  FILLOVAL :
                g.fillOval (1,1,size.width - 3 ,size.height - 3);
                break;
            case  ARC :
                g.drawArc (1,1,size.width - 3 ,size.height - 3, 90,270);
                break;
            case  FILLARC :
                g.fillArc (1,1,size.width - 3 ,size.height - 3, 90,270);
                break;
            case  POLIGON :
                Polygon p = new Polygon ();
                p.addPoint ((size.width - 1) / 2, 1);
                p.addPoint ((size.width - 1) / 5 , size.height - 1);
                p.addPoint ((size.width - 1), (size.height - 1) / 3);
                p.addPoint (1 , (size.height - 1) / 3);
                p.addPoint ((size.width - 1) * 4 / 5, size.height - 1);
                g.drawPolygon (p);
                break;
            case  FILLPOLIGON :
                p = new Polygon ();
                p.addPoint ((size.width - 1) / 2, 1);
                p.addPoint ((size.width - 1) / 5 , size.height - 1);
                p.addPoint ((size.width - 1), (size.height - 1) / 3);
                p.addPoint (1 , (size.height - 1) / 3);
                p.addPoint ((size.width - 1) * 4 / 5, size.height - 1);
                g.fillPolygon (p);
                break;
        }
    }
}

public class primitive extends Applet {

        public void init () {
            setLayout (new GridLayout (2,7));

            for (int i = Figura.LINE; i <= Figura.FILLPOLIGON; i ++) {
                Figura f = new Figura (i);
                add (f);
            }   
    }
}