怎么我的代码中paint方法里g.drawImage(oimg,0,0,this)怎么没有执行啊？请高人指点·····

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class DrawLine1 extends Frame
{
Image oimg = null;
Graphics og = null;
//Vector vline = new Vector();
int orgX;
int orgY;
int endX;
int endY;
public void paint(Graphics g)
{

g.drawImage(oimg,0,0,this);


}
public DrawLine1()
{
setSize(400,400);
setTitle("DrawLine1");
setVisible(true);
Dimension d = getSize();
Image oimg = createImage(d.width,d.height);
Graphics og = oimg.getGraphics();

addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
dispose();
System.exit(0);
}
});

this.addMouseListener(new MouseAdapter()
{

public void mousePressed(MouseEvent e)
{
orgX = e.getX();
orgY = e.getY();

}
public void mouseReleased(MouseEvent e)
{
endX = e.getX();
endY = e.getY();

Graphics og = getGraphics();


og.setColor(Color.RED);
og.setFont(new Font("null",Font.ITALIC|Font.BOLD,30));
og.drawLine(orgX,orgY,e.getX(),e.getY());
og.drawString(orgX + "," + orgY,orgX,orgY);
og.drawString(e.getX() + "," + e.getY(),e.getX(),e.getY());

}
});
}

public static void main(String[] args) {
// TODO: Add your code here
DrawLine1 mainFrame = new DrawLine1();

}
}

在drawImage之前写一句System.out.println("aa"); 会发现运行的时候打印了aa说明drawImage一定会被调用到，至于这句话有没有起到你期望的作用，那是另一个问题，并且你没有给出足够的信息

同问。。。