This is a conversion of the previous AWT rolling dice example to Swing.  Also not a "better" method for rendering the die.  This continues the prelude to Swing based GUIs starting in the next section.

LangOneFConverted.java source

Java Source --->

01: import javax.swing.*;
02: import java.awt.*;
03: import java.awt.event.*;
04: 
05: public class LangOneFConverted extends JApplet implements ActionListener
06: {
07:    JButton roll;
08:    JDie dieOne, dieTwo;
09:    Container c;
10: 
11:    public void init()
12:    {
13:       c = getContentPane();
14:       c.setLayout(new FlowLayout());
15:       c.setBackground(Color.white);
16:       roll = new JButton("Roll");
17:       c.add(roll);
18:       roll.addActionListener(this);
19:       dieOne = new JDie(2);
20:       dieTwo = new JDie(5);
21:       c.add(dieOne);
22:       c.add(dieTwo);
23:    }
24: 
25:    public void actionPerformed (ActionEvent e)
26:    {
27:       dieOne.rollDie();
28:       dieTwo.rollDie();
29:    }
30: 
31: }
32: 
33: class JDie extends JPanel
34: {
35:    private int dieValue;
36: 
37:    public JDie(int value)
38:    {
39:       dieValue = value;
40:       setBackground(Color.white);
41:    }
42: 
43:    public void rollDie()
44:    {
45:       dieValue = (int)(Math.random()*6+1);
46:       repaint();
47:    }
48: 
49:    public Dimension getPreferredSize()
50:    {
51:       return new Dimension(70,70);
52:    }
53: 
54:    public void paintComponent(Graphics g)
55:    {
56:       super.paintComponent(g);
57:       g.setColor(Color.red);
58:       g.fillRoundRect(0,0,70,70,20,20);
59:       g.setColor(Color.white);
60: 
61:       //The following code provided by Chris Martian, CS4B Spring '03
62:       // int[] x = {10, 50, 50, 10, 30, 30};
63:       // int[] y = {10, 50, 10, 50, 10, 50};
64:       // if (dieValue % 2 == 1)
65:       //    g.fillOval(30, 30, 10, 10);
66:       // for (int i = 0; i < (dieValue / 2) * 2; i++)
67:       //    g.fillOval(x[i], y[i], 10, 10);
68:          
69:       //The following code provided by Tom Fangrow, CS4B Spring '06
70:       int[] a = {30, 30, 10, 10, 50, 50, 50, 10, 10, 50, 30, 10, 30, 50};
71:       for(int i = 2*(1-dieValue % 2); i < 2*(dieValue+1-dieValue % 2); i+=2)
72:          g.fillOval(a[i], a[i+1], 10, 10);
73: 
74:    }
75: }