解决java Graphics drawImage 无法显示图片的问题

package com.sitech.test; 
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
 
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
 
public class ImageTest {
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new ImageFrame();
frame.setTitle("sasdas");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true); 
} 
});    
}
}
class ImageFrame extends JFrame
{
public ImageFrame()
{
add(new ImageComponent());
pack();  
} 
 
} 
class ImageComponent extends JComponent
{
private static final int DEFAULT_WIDTH =800;
private static final int DEFAULT_HEIGHT = 800; 
private Image image; 
public ImageComponent()
{
    String path = "com/sitech/test/111.jpg";
image= new ImageIcon(ClassLoader.getSystemResource(path)).getImage();// 通过这种方式加载图片 
 
}
public void paintComponent(Graphics g)
{
    Graphics2D g2 = (Graphics2D)g;  
if(image==null)return;
 
int imageWidth = image.getWidth(this);
int imageHeight = image.getHeight(this);
 
g2.drawImage(image,0,0,this);//这种方式 
 
 
for(int i =0 ;i*imageWidth<= getWidth();i++)
    for(int j = 0 ;j*imageHeight<=getHeight();j++)
	if(i+j>0)
	    g2.copyArea(0, 0, imageWidth, imageHeight,i*imageWidth,j*imageHeight);  
}
public Dimension getPreferredSize(){return new Dimension(DEFAULT_WIDTH,DEFAULT_HEIGHT);}
}

String path = "com/sitech/test/111.jpg";
image= new ImageIcon(ClassLoader.getSystemResource(path)).getImage();
//通过这种方式加载图片

g2.drawImage(image,0,0,this);
//这种方式 最后一个参数使用 this 才能在第一次运行时 显示图片，之前我使用的是null

    public void paint(Graphics g) {
        g.drawImage(imagesBomb[count], x, y, null)
        count++;
        if (count >= 42) {
            this.life = false;
        }
    }

    public void paint(Graphics g) {
        if(!g.drawImage(imagesBomb[count], x, y, null)){
            for (int i = 0; i < 43; i++) {
                g.drawImage(imagesBomb[i], -1000, -1000, null);
            }
            g.drawImage(imagesBomb[count], x, y, null);
        }
        count++;
        if (count >= 42) {
            this.life = false;
        }
    }

Image img = Toolkit.getDefaultToolkit().getImage(imgPath);
MediaTracker t = new MediaTracker(this);
t.addImage(img, 0);
t.waitForAll();