neon.java

Java 范例实战 光盘使用说明 ========================== 本光盘的文件结构如下所示： =====================================

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

public class Neon extends Applet
    implements Runnable
{

    Image mAge[] = null;
    int iMagNdx = 0;
    Thread endit = null;

    public void init()
    {

        resize(500, 250);

    }

    public void Paint(Graphics g)
    {

        update(g);

    }

    public void update(Graphics g)
    {

        if(mAge[iMagNdx] == null)
            g.drawString("Error loading pic", 0, 170);
        g.drawImage(mAge[iMagNdx], 0, 0, this);

    }

    public void start()
    {

        if(endit == null)
        {

            endit = new Thread(this);
            endit.start();

        }

    }


    public void stop()
    {

        endit = null;

    }

    public void run()
    {

        mAge = new Image[2];
        String s = getParameter("picture1");
        String s1 = getParameter("picture2");
        mAge[0] = getImage(getDocumentBase(), s);
        mAge[1] = getImage(getDocumentBase(), s1);
        do
        {

            repaint();
            iMagNdx = iMagNdx != 0 ? 0 : 1;
            try
            {

                Thread.sleep((int)(Math.random() * 500D));

            }
            catch(InterruptedException _ex) 
            {
            }

        }
        while(true);
        
    }

}