图像有时会消失

Question

我遇到的问题是图像数组中的第一个图像有时不会被绘制？有什么想法吗？这是我在Java中的代码：gui类有主要方法。我也尝试在GUI类中读取图像并在imagesPanel的构造函数中传递图像。在那种情况下，什么都没有得出。

import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import javax.imageio.ImageIO;
import javax.swing.JPanel;

public class ImagePanel extends JPanel implements MouseMotionListener {

    int posX=0;
    int posY=0;

    ArrayList<Image> images = new ArrayList<Image>();
    Image image;

    public ImagePanel() {
        this.addMouseMotionListener(this);

    }

    public void paintComponent(Graphics g) {
        try {
            images.add(ImageIO.read(new File("lion.jpeg")));
            images.add(ImageIO.read(new File("monkey.jpg")));
        } catch (IOException e) {

        }
        super.paintComponent(g);
        for(int i=0;i<images.size();i++){
            g.drawImage(images.get(i), posX, posY,100,100, this);
            posX=+120;
        }


    }

    @Override
    public void mouseDragged(MouseEvent arg0) {
        // TODO Auto-generated method stub
//      posX = arg0.getX();
//      posY = arg0.getY();
//      System.out.println(posX + " " + posY);
//      repaint();
    }

    @Override
    public void mouseMoved(MouseEvent arg0) {
        // TODO Auto-generated method stub

    }

}


    import javax.swing.JFrame;
    import javax.swing.SwingUtilities;

    public class GUI {

        public GUI() {
            createAndShowGUI();
        }

        private static void createAndShowGUI() {
            JFrame f = new JFrame("Image Viewer");
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setSize(800, 800);
            f.setVisible(true);

            ImagePanel imagePanel = new ImagePanel();
            f.add(imagePanel);
        }

        public static void main(String[] args) {
            new GUI();
        }
    }