各位，进来看看，我问个问题！！！！！！！！！！！！！1

[loader]

import java.awt.*;
import javax.swing.ImageIcon;
import javax.swing.*;

public class helloworld
{
public static void main(String[] args)
{
JWindow JW = new JWindow();
JW.setSize(800, 600);
JW.setLocation(200, 100);
JW.getContentPane().add(new MyCanvas());//这个地方
JW.show();
}
}

class MyCanvas extends Canvas
{
ImageIcon logo = new ImageIcon("1.jpg");
public void paint(Graphics g)
{
g.drawImage(logo.getImage(), 0, 0, 200, 200, null);
}
}

//这个地方调用得是MyCanvas的构造函数么，但是他并没有调用paint方法呀
//谢谢