为什么图片加载不出来？

public class text2 extends Frame{

Image img = GameUtil.getImage("images/fly.jpg");


public void launchFrame(){
    setSize(500,300);
    setLocation(0,0);
    setVisible(true);

    addWindowListener(new WindowAdapter(){
        public void windowClosing(WindowEvent e){
            System.exit(0);
        }//点关闭可以关闭窗口
    });

}
public void paint(Graphics g){
Color c = g.getColor();
g.setColor(Color.blue);
g.drawOval(100, 100, 100, 100);
g.drawImage(img, 200, 200, null);
}

public static void main(String args[]){
    text2 t1 = new text2();
    t1.launchFrame();
}

}
报错跳转为
public static BufferedImage read(URL input) throws IOException {
if (input == null) {
throw new IllegalArgumentException("input == null!");
}

setVisible(true);放在main方法里面

你自己跟踪调试下哪一块代码报错啊，你的代码不全没有GameUtil类的信息，没办法测试。

package text;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.net.URL;
import java.io.IOException;

import javax.imageio.ImageIO;

//工具类
public class GameUtil {

public static Image getImage(String path){
    URL u =GameUtil.class.getClassLoader().getResource(path);
    BufferedImage img =null;
    try{
        img = ImageIO.read(u);
    }catch(IOException e){
        e.printStackTrace();
    }
    return img;
}

}