如何创建重叠的背景和前景图像？

该解决方案还解决中提到的问题：图像在Jframe的是覆盖彼此不显示在两个图像海誓山盟

如果我们尝试添加背景图像和一些前景图像，那么如果我们打算让这些图像彼此重叠，则可能会有些棘手，因为
Java提供的许多布局可能会阻止组件（例如JLabel）彼此重叠。将图像定位到确切位置也是一个问题。

与其创建多个装满imageIcon的JLabel，不如直接在面板上绘制。这是一个自定义面板，其中包含我们要绘制的图像实例。

class DrawingSpace extends JPanel{    private BufferedImage bg, hero;    private int bgWidth, bgHeight;    private int heroWidth, heroHeight;      private int scWidth, scHeight;    private int mouseX, mouseY;    public DrawingSpace(){   loadImages();        init();  setPreferredSize(new Dimension(scWidth, scHeight));  addMouseMotionListener(new MouseHandler());         }    private void init(){        mouseX = 0;        mouseY = 0;        heroWidth = hero.getWidth();        heroHeight = hero.getHeight();   bgWidth = bg.getWidth();        bgHeight = bg.getHeight();   scWidth = bgWidth;        scHeight = bgHeight; }    private void loadImages(){        try{ bg = ImageIO.read(getClass().getResource("Images/background.jpg")); hero = ImageIO.read(getClass().getResource("Images/knight.png"));        }catch(IOException ioe){System.out.println("Unable to open file");}    }    @Override public void paintComponent(Graphics g){        super.paintComponent(g);     g.drawImage(bg, 0, 0, bgWidth, bgHeight, null);        g.drawImage(hero, mouseX-(heroWidth/2), mouseY-(heroHeight/2), heroWidth, heroHeight, null); }    private class MouseHandler implements MouseMotionListener    {        @Override public void mouseMoved(MouseEvent e){ mouseX = e.getX(); mouseY = e.getY(); repaint();        }        @Override public void mouseDragged(MouseEvent e){}      }}

A runner class to drive the pres:

class KnightRunner{       public static void main(String[] args){        SwingUtilities.invokeLater(new Runnable(){ @Override public void run(){     Jframe frame = new Jframe("Knight Runner");     frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.add(new DrawingSpace());     frame.pack();     frame.setLocationRelativeTo(null);     frame.setVisible(true);   }        });    }       }