请高手相助！（急）

Question

我也是初学者，你忘了两个变量声明，
而且我没找到你调用的方法(BufferedImage)createImage(300,400);
所以我直接用的构造器，调试成功！
  int i,j; public huahua()
{
setLayout(new FlowLayout());
setSize(300,300);
t = new Thread(this);
t.start();
image=new BufferedImage(300,400,BufferedImage.TYPE_INT_RGB);
g=image.createGraphics();
}

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;public class huahua
    extends Frame
    implements Runnable
{
    Thread t;
    BufferedImage image;
    Graphics2D g;
    int i,j;    public huahua()
    {
        setLayout(new FlowLayout());
        setSize(300, 300);
        setVisible(true);
        t = new Thread(this);
        t.start();
        image = (BufferedImage) createImage(300, 400);
        g = image.createGraphics();
    }    public void paint(Graphics gg)
    {
        Graphics2D ggg;
        ggg = (Graphics2D) gg;
        g.fillRect(23, 55, i + 100, j + 100);
        ggg.drawImage(image, 0, 0, this);
    }    public void run()
    {
        while (true)
        {
            try
            {
                Thread.sleep(200);
            }
            catch (InterruptedException e)
            {}
            if (i == 200)
            {
                i = 0;
            }
            i++;
            if (j == 200)
            {
                j = 0;
            }
            j++;
            repaint();
        }
    }    public static void main(String args[]) throws Exception
    {
        new huahua();
    }
}

Answer 2

1.i,j需要声明。
2.createImage(300, 400);需要在组件显示之后调用。