一个用JAVA编写的GUI程序问题，紧！！！！

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一个用JAVA编写的GUI程序问题，紧！！！！5

我是JAVA初学者，在以下代码基础上修改一下，用J2SE的GUI组件设计一块类似于屏保的砖墙，要求：
    （1）、程序在绘制完第一块砖头后，会间隔1秒钟再接着绘制第二块砖头，如此类推，直至将整个JPanel充满为止。
    （2）、当充满整个JPanel后，先前的第一个砖头会自动消失，接着第二个砖头会消失，直至将整个JPanel清空。
    （3）、清空后，先前的第一块砖头的位置将再画一块砖头，循环第（1）步的操作。

    如果有哪位大知道怎么弄得话，请将代码发送到以下邮箱 su1989hai@126.com，小弟无比感谢！！！

这个是BrickWall.java主程序

// Exercise 20.11: BrickWall.java
// Program builds a brick wall using rectangles.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class BrickWall extends JFrame
{
// DrawJPanel for displaying bricks
private DrawJPanel drawingJPanel;

// no-argument constructor
public BrickWall()
{
      createUserInterface();
}

// create and position GUI components; register event handlers
private void createUserInterface()
{
      // get content pane for attaching GUI components
      Container contentPane = getContentPane();

      // enable explicit positioning of GUI components
      contentPane.setLayout( null );

      // set up drawingJPanel
      drawingJPanel = new DrawJPanel();
      drawingJPanel.setBounds( 0, 0, 450, 250 );
      drawingJPanel.setBackground( Color.WHITE );
      contentPane.add( drawingJPanel );

      // set properties of application's window
      setTitle( "Brick Wall" ); // set title bar text
      setSize( 454, 275 );        // set window size
      setVisible( true );        // display window

} // end method createUserInterface

// main method
public static void main( String[] args )
{
      BrickWall application = new BrickWall();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

} // end method main

} // end class BrickWall

这个是MyRectangle.java，一个画矩形的类

// Tutorial 20: MyRectangle.java
// This class defines the MyRectangle object.
import java.awt.*;

public class MyRectangle extends Rectangle
{
// instance variable to hold fillColor of MyRectangle
private Color fillColor;

// constructor
public MyRectangle( int xValue, int yValue, int widthValue,
      int heightValue, Color colorValue )
{
      // call constructor of superclass
      super( xValue, yValue, widthValue, heightValue );

      // set fillColor of MyRectangle
      setFillColor( colorValue );

} // end constructor

// set fillColor value
public void setFillColor( Color colorValue )
{
      fillColor = colorValue;

} // end method setColor

// get fillColor value
public Color getFillColor()
{
      return fillColor;

} // end method getColor

// draw MyRectangle
public void drawMyRectangle( Graphics g )
{
      g.setColor( fillColor );
      g.fillRect( x, y, width, height );

} // end method drawRect

} // end class MyRectangle

这个是DrawJPanel.java，画砖墙的类

// Exercise 20.11: DrawJPanel.java
// This class defines the DrawJPanel object.
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Random;
import javax.swing.*;

public class DrawJPanel extends JPanel
{
// ArrayList object to hold MyRectangle objects
private ArrayList brickArrayList = new ArrayList();

// no-argument constructor
public DrawJPanel()
{
      super();

      drawBricks();

} // end contructor

// add randomNumber brick to ArrayList and draw all bricks
public void paintComponent( Graphics g )
{
      super.paintComponent( g );

      // create iterator
      Iterator traverse = brickArrayList.iterator();

      // iterate through ArrayList and draw all MyRectangles
      while ( traverse.hasNext() )
      {
        MyRectangle currentRectangle =
            ( MyRectangle ) traverse.next();

        currentRectangle.drawMyRectangle( g ); // draw brick

      } // end while loop

} // end method paintComponent

// draw 10 rows and 9 columns of bricks
public void drawBricks()
{
      // declare a new MyRectangle object


      // set the bricks color
      Color myColor = Color.RED;

      // initialize width and height variables
      int width = 45;
      int height = 20;

      for(int row=0;row <=9;row++)
      {
      int y=25;
      y=y*row;

        for(int column=0;column <=9;column++)
        {
        int x=50;
        x=x*column;

        if(row%2==1)
        {
                MyRectangle brick=new MyRectangle(x,y,width,height,myColor);
                brickArrayList.add(brick);
        }
        else
        {
        MyRectangle bricks=new MyRectangle(x-25,y,width,height,myColor);
        brickArrayList.add(bricks);
        }
        }
      }

      // repaint JPanel
      repaint();

} // end method drawBricks

} // end class DrawJPanel

Swing