图形没有在JLayeredPane中显示(java swing)

我正在尝试逐步建立基于用户输入的图像.我正在尝试做的是创建一堆图形并将它们添加为图层但是我遇到了一些问题,因为它们不会显示出来.这是我正在使用的代码：

public class ClassA 
{
    protected final static int dimesionsY = 1000;
    private static int dimesionsX;
    private static JFrame window;
    private static JLayeredPane layeredPane;

    public void init()
    {
        window = new JFrame("Foo");
        dimesionsX = // some user input
        window.setPreferredSize(new Dimension(dimesionsX,dimesionsY));
        window.setLayout(new BorderLayout());

            layeredPane = new JLayeredPane();
        layeredPane.setBounds(0,dimesionsX,dimesionsY);
        window.add(layeredPane,BorderLayout.CENTER);

            ClassB myGraphic = new ClassB();    
        myGraphic.drawGraphic();

        layeredPane.add(myGrpahic,new Integer(0),0);

        window.pack();
        window.setVisible(true);
    }
}



public class ClassB extends JPanel
{
    public void drawGraphic()
    {
        repaint();
    }

    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);

        g.setColor(Color.BLACK);
        g.fillRect(10,10,100,100);
    }
}

但是我的图形似乎没有出现,我不明白为什么.我还尝试将它添加到JPanel中,将JPanel添加到JLayeredPane但是这也不起作用.

请有人帮帮我吗？

解决方法

例如.,

import java.awt.*;

import javax.swing.*;

public class ClassA {
   protected final static int dimesionsY = 800;
   protected final static int dimesionsX = 1000; //!!
   private static JFrame window;
   private static JLayeredPane layeredPane;

   public void init() {
      window = new JFrame("Foo");
      // !! dimesionsX = // some user input

      //!! window.setPreferredSize(new Dimension(dimesionsX,dimesionsY));
      window.setLayout(new BorderLayout());

      layeredPane = new JLayeredPane();
      //!! layeredPane.setBounds(0,dimesionsY);
      layeredPane.setPreferredSize(new Dimension(dimesionsX,dimesionsY));
      window.add(layeredPane,BorderLayout.CENTER);

      ClassB myGraphic = new ClassB();
      myGraphic.drawGraphic();

      myGraphic.setSize(layeredPane.getPreferredSize());
      myGraphic.setLocation(0,0);
      //!! layeredPane.add(myGraphic,0);
      layeredPane.add(myGraphic,JLayeredPane.DEFAULT_LAYER);

      window.pack();
      window.setVisible(true);
   }

   public static void main(String[] args) {
      new ClassA().init();
   }
}

class ClassB extends JPanel {
   public void drawGraphic() {
      repaint();
   }

   public void paintComponent(Graphics g) {
      super.paintComponent(g);

      g.setColor(Color.BLACK);
      g.fillRect(10,100);
   }
}

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