JFrame内的绝对定位图形JPanel被空白部分阻止

Question

我正在通过制作一个拼图程序来提高对Java的理解，尤其是Java GUI。当前，用户选择图像，该图像被切成指定的数量。这些棋子随机绘制到屏幕上，但似乎被其他棋子的空白部分覆盖，并且并非全部都出现，但是我可以打印出所有坐标。我正在使用绝对定位，因为LayoutManager似乎不起作用。我曾短暂尝试过layeredPanes，但他们让我感到困惑，似乎并不能解决问题。我真的很感谢您的帮助。这是两个相关的类：import javax.swing.*;import java.awt.*;import java.awt.image.*;import java.awt.event.*;public class PuzzlePieceDriver extends JFrame{  private static Dimension SCREENSIZE = Toolkit.getDefaultToolkit().getScreenSize();  private static final int HEIGHT = SCREENSIZE.height;  private static final int WIDTH = SCREENSIZE.width;  public static int MY_WIDTH;  public static int MY_HEIGHT;  private static BufferedImage image;  private int xPieces = PuzzleMagicDriver.getXPieces();  private int yPieces = PuzzleMagicDriver.getYPieces();  private PuzzlePiece[] puzzle = new PuzzlePiece[xPieces*yPieces];  public Container pane = this.getContentPane();  private JLayeredPane layeredPane = new JLayeredPane();  public PuzzlePieceDriver(ImageIcon myPuzzleImage)  {    MY_WIDTH = myPuzzleImage.getIconWidth()+(int)myPuzzleImage.getIconHeight()/2;    MY_HEIGHT = myPuzzleImage.getIconHeight()+(int)myPuzzleImage.getIconHeight()/2;    setTitle("Hot Puzz");setSize(MY_WIDTH,MY_HEIGHT);setLocationByPlatform(true);pane.setLayout(null);image = iconToImage(myPuzzleImage); //pass image into bufferedImage formpuzzle = createClip(image);//pane.add(layeredPane);setVisible(true);  }//end constructor  public static BufferedImage iconToImage(ImageIcon icon)  {    Image img = icon.getImage(); int w = img.getWidth(null); int h = img.getHeight(null); BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics g = image.createGraphics();     // Paint the image onto the buffered image    g.drawImage(img, 0, 0, null);    g.dispose();    return image;  }//end BufferedImage  protected int randomNumber(int min, int max)  {    int temp =     min + (int)(Math.random() * ((max - min) + 1)); return temp;  }