doublebuffer.java

该程序是实现JAVA中用applet实现图片的加载和视频

package imagtest;
import java.applet.Applet;
import java.awt.HeadlessException;
import java.awt.*;
public class DoubleBuffer extends Applet
{
  private Image[] imgs;
  private int totalImages=10;
  private int currentImage;
  private int i=0;
  private Image imgBuf;
  private Graphics gBuf;
  private MediaTracker mt;
  public void init()
  {
    mt=new MediaTracker(this);
    imgBuf=createImage(600,400);
    gBuf=imgBuf.getGraphics();
    gBuf.setColor(Color.white);
    gBuf.fillRect(0,0,600,400);
    imgs=new Image[totalImages];
    for(int i=0;i<totalImages;i++)
    {
      imgs[i]=getImage(getDocumentBase(),"T"+(i+1)+".gif");
      mt.addImage(imgs[i],i);
    }
    try {
      mt.waitForID(0);
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }
  public void start()
  {
    currentImage=0;
    gBuf.drawImage(imgs[currentImage],0,0,this);
    currentImage=1;
  }
  public void paint(Graphics g)
  {

    System.out.println("draw:"+i++);
    g.drawImage(imgBuf,0,0,this);
    if(mt.checkID(currentImage,true))
    {
      gBuf.fillRect(0, 0, 600, 400);
      gBuf.drawImage(imgs[currentImage], 0, 0, this);
      currentImage = ++currentImage % 10;
    }
    try {
      Thread.sleep(500);
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
    repaint();
  }
  public void update(Graphics g)
  {
    paint(g);
  }

}