我无法在applet上加载Image

Question

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class MoveIt extends Applet implements ActionListener
{
    //declare variables and construct color
    private Image cup;
    public Panel keyPad;
    public int top = 15;
    public int left = 15;
    private Button keysArray[];

    //create components for applet
    public void init()
    {
        cup = getImage(getDocumentBase(), "cup.gif");
        Canvas myCanvas = new Canvas();
        setBackground(Color.blue);

            keyPad = new Panel();


        //Construct keyPad and 5 buttons
        keysArray = new Button[5];
        keysArray[0] = new Button("Up");
        keysArray[1] = new Button("Down");
        keysArray[2] = new Button("Right");
        keysArray[3] = new Button("Left");
        keysArray[4] = new Button("Center");

        //set frame and keypad layout to border layout
        setLayout(new BorderLayout());
        keyPad.setLayout(new BorderLayout());

        //add components to keyPadPanel
        keyPad.add(keysArray[0], BorderLayout.NORTH);
        keyPad.add(keysArray[1], BorderLayout.SOUTH);
        keyPad.add(keysArray[2], BorderLayout.EAST);
        keyPad.add(keysArray[3], BorderLayout.WEST);
        keyPad.add(keysArray[4], BorderLayout.CENTER);

        //Add keypadPanel and Canvas to frame
        add(keyPad, BorderLayout.SOUTH);
        add(myCanvas, BorderLayout.NORTH);

        //add actionListener to each button
        for(int i=0; i<5; i++)
        {
            keysArray[i].addActionListener(this);
        }
    }
    //Drag image using paint method
    public void paint(Graphics g)
    {
        g.drawImage(cup, left, top, this);
    }

    public void actionPerformed(ActionEvent e)
    {
        String arg = e.getActionCommand();
        if(arg=="Up")
        {
            top-=15;
        }
        if(arg=="Down")
        {
            top+=15;
        }
        if(arg=="Left")
        {
            left-=15;
        }
        if(arg=="Rigth")
        {
            top+=15;
        }
        if(arg=="Center")
        {
            top=60;
            left=125;
        }

        repaint();
    }
}

图像cup.gif与类，java和Html文件一起位于C盘中。每当我运行applet时，都不会生成图像。其他一切正常。请非常感谢任何帮助以使这项工作。图像应该根据applet上的按钮命令移动，但applet上没有显示图像。