该用什么软件制作比较好？还有下面的程序没有main函数，该怎么运行呢？
/*
 * Java(TM) SE 6 Version
 */

import java.applet.Applet;
import java.awt.Graphics;

//No need to extend JApplet, since we don't add any components;
//we just paint.
public class Simple extends Applet {

    StringBuffer buffer;

    public void init() {
        buffer = new StringBuffer();
        addItem("initializing... ");
    }

    public void start() {
        addItem("starting... ");
    }

    public void stop() {
        addItem("stopping... ");
    }

    public void destroy() {
        addItem("preparing for unloading...");
    }

    private void addItem(String newWord) {
        System.out.println(newWord);
        buffer.append(newWord);
        repaint();
    }

    public void paint(Graphics g) {
    //Draw a Rectangle around the applet's display area.
        g.drawRect(0, 0,
           getWidth() - 1,
           getHeight() - 1);

    //Draw the current string inside the rectangle.
        g.drawString(buffer.toString(), 5, 15);
    }
}

不太明白，该怎么写？

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