Question

请教JAVA问题

import java.applet.*;
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import java.awt.event.*;

public class exampel7_6 extends Applet{
Image myPicture;

public void init(){
myPicture=getImage(getCodeBase(),"1.jpg");
Image offScreenImage=createImage(size().width,size().height);
Graphics offScreenGc=offScreenImage.getGraphics();
offScreenGc.drawImage(myPicture,0,0,this);
new BufferedDemo(myPicture);
}

public boolean imageUpdate(Image img,int infoFlg,int x,int y,int w,int h){
if(infoFlg==ALLBITS){
repaint();
return false;
} else return true;
}
}

class BufferedDemo extends JFrame{
public BufferedDemo(Image img){
this.getContentPane().add(new PicPanel(img));
setTitle("双缓冲技术演示");
setSize(300,300);
setVisible(true);
}
}

class PicPanel extends JPanel implements MouseListener,MouseMotionListener{
int x=0,y=0,dx=0,dy=0;
BufferedImage bimg1,bimg2;
boolean upState=true;
public PicPanel(Image img){
this.setBackground(Color.white);
this.addMouseListener(this);
this.addMouseMotionListener(this);
bimg1=new BufferedImage(img.getWidth(this),img.getHeight(this),BufferedImage.TYPE_INT_ARGB);
bimg2=new BufferedImage(img.getWidth(this),img.getHeight(this),BufferedImage.TYPE_INT_ARGB);
Graphics2D g2D1=bimg1.createGraphics();
Graphics2D g2D2=bimg2.createGraphics();
g2D1.drawImage(img,0,0,this);
g2D2.drawImage(img,0,0,this);
g2D2.drawRect(1,1,img.getWidth(this)-3,img.getHeight(this)-3);
}
TO BE CONTINUED IN THE APPENDED PAGE
篇幅有限，问题没有写出来，请不要回答

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Answer 1

我回答了你回复了上传代码上来吧