一个目前还没有人能解决问题！

Question

java.awt.Canvas有这个方法getCodeBase()吗？？

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.net.*;   public class canvaser extends java.applet.Applet implements ActionListener {      Button button1;
      BoxCanvas boxcanvas;
      int loop_index;
                                                                         
    
      Image image; //修改
      
      public void init() {
         
         add(button1=new Button("Move Rectangle"));
         button1.addActionListener(this);         image = getImage(getCodeBase(),"java.gif"); //修改
         boxcanvas=new BoxCanvas(image);     //修改
         boxcanvas.resize(150,250);
         add(boxcanvas);        
 
     }      public void actionPerformed(ActionEvent event) {
         
            if(event.getSource()==button1) {
            for(loop_index=0; loop_index<250; loop_index++) {
               boxcanvas.setLocation(loop_index,50);
     }    }   }
  
  }      class BoxCanvas extends java.awt.Canvas {
         Image image;
        
         public BoxCanvas(Image uimage) {     //修改
            image = uimage;
            
      }   
         
         public void paint(Graphics g) {
            
            g.drawImage(image,0,0,30,30,this);      }    }