netbeans source med "init". hvordan køres?

Har fundet følgende lille applet på nettet. Programmet viser to terninger som man kan slå ved at klikke.

Jeg vil gerne køre det i netbeans, men den brokker sig da der ikke er nogen main method.

Hvad gør jeg forkert.

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package dicewithbutton;

/*
Shows a pair of dice that are rolled when the user clicks on a "Roll"
button. It is assumed that the applet is sized so that the canvas
on which the dice are drawn is about 100 by 100 pixels. A clicking
sound is played when the dice are rolled.

This file defines two classes: A main applet class, DiceWithButton,
and a canvas class, DiceCanvas. The DiceCanvas class is not public
and is not meant to be used outside this file.
*/

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class DiceWithButton extends Applet implements ActionListener{

// This applet class sets things up, and it responds to clicks
// on the Roll button by telling the DiceCanvas to roll the dice.

DiceCanvas dice; // A canvas that displays the dice.
// (This has to be an instance variable
// because I use it in the actionPerformed
// method.)

public void init() {

// Initialize the applet by setting its layout manager to
// be a BorderLayout and creating the two components that
// are shown on the applet.

setBackground(Color.blue);
setLayout(new BorderLayout(2,2)); // Use BorderLayout with
// 2 pixels between components.

dice = new DiceCanvas(); // Canvas to show the dice.

add(dice, BorderLayout.CENTER); // Dice go in large, center
// area of the applet.

Button rollBttn = new Button("Roll!"); // The roll button.
rollBttn.addActionListener(this); // Applet listens to this button.
rollBttn.setBackground(Color.lightGray);

add(rollBttn, BorderLayout.SOUTH); // The button occupies a strip
// along the bottom.
} // end init()

public Insets getInsets() {
// leave a 2-pixel border around the edges of the applet.
return new Insets(2,2,2,2);
}

public void actionPerformed(ActionEvent evt) {
// Respond to a click on the "Roll" button by rolling the dice
// and playing a sound.
dice.roll();
play(getCodeBase(), "click.au");
}

} // end class DiceWithButton

//---------------------------------------------------------------

class DiceCanvas extends Canvas {

// This canvas class displays the dice. The dice are
// rolled by calling this class's roll() method.

int die1 = 4; // The values shown on the dice.
int die2 = 3;

DiceCanvas() {
// Constructor. To initialize the canvas, set a
// light blue background color.
setBackground( new Color(200,200,250) );
}

public void paint(Graphics g) {
// The paint method draws the two dice.
drawDie(g, die1, 10, 10);
drawDie(g, die2, 55, 55);
}

void drawDie(Graphics g, int val, int x, int y) {
// Draw a die with upper left corner at (x,y). The die is
// 3 5 by 35 pixels in size. The val parameter gives the
// value showing on the die (that is, the number of dots).
g.setColor(Color.white);
g.fillRect(x, y, 35, 35);
g.setColor(Color.black);
g.drawRect(x, y, 34, 34);
if (val > 1) // upper left dot
g.fillOval(x+3, y+3, 9, 9);
if (val > 3) // upper right dot
g.fillOval(x+23, y+3, 9, 9);
if (val == 6) // middle left dot
g.fillOval(x+3, y+13, 9, 9);
if (val % 2 == 1) // middle dot (for odd-numbered val's)
g.fillOval(x+13, y+13, 9, 9);
if (val == 6) // middle right dot
g.fillOval(x+23, y+13, 9, 9);
if (val > 3) // bottom left dot
g.fillOval(x+3, y+23, 9, 9);
if (val > 1) // bottom right dot
g.fillOval(x+23, y+23, 9,9);
}

void roll() {
// Roll the dice by randomizing their values. Tell the
// system to repaint the applet, to show the new values.
// Also, play a clicking sound to give the user more feedback.
die1 = (int)(Math.random()*6) + 1;
die2 = (int)(Math.random()*6) + 1;
repaint();
}

} // end class DiceCanvas