在背景图像前面画一个图像

Question

我试图制作一个Swing程序，我目前在整个屏幕上有一个图像作为背景延伸，现在我只想在这个图像上绘制一个较小的图像

我的视频构造函数并绘制背景和前景图像：

    public Video(BufferedImage foreground, BufferedImage background){
        pane = this.getContentPane(); //get the content pane to place components
        pane.setLayout(null); //use absolute positioning (using Insets)
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
            e.printStackTrace();
        }
        this.setVisible(true);
        this.setBounds(0,0,(int)Toolkit.getDefaultToolkit().getScreenSize().getWidth(),(int)Toolkit.getDefaultToolkit().getScreenSize().getHeight());
        DrawImage panel = new DrawImage(background); 
        add(panel);
        this.image = foreground;
        DrawForeground fg = new DrawForeground(image); 
        add(fg);
        fg.setVisible(true);//don't make image visible until showImageAt() gives it a place to be


    }

我的drawImage方法（绘制前景非常相似，但大小不同）

import java.awt.Dimension; 
import java.awt.Graphics; 
import java.awt.Image;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon; 
import javax.swing.JFrame; 
import javax.swing.JPanel;


class DrawImage extends JPanel {

    private BufferedImage img;


    public DrawImage(BufferedImage img) {
        this.img = img;
        Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
        setPreferredSize(size);
        setMinimumSize(size);
        setMaximumSize(size);
        setSize(size);
        setLayout(null);
    }

    public void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0,this.getWidth(),this.getHeight(), null);
    }

}