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 form

puzzle = 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;

  }