Help with and animation

Question

hi i m trying to make an animation similar to
http://sstl.cee.uiuc.edu/java/twostory/index.html
i have made a block moving can anybody help me or advice me how to do make some thing similar..
thanks....
package DEMO2;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class DEMO2 {
     public static void main(String[] args) {
     JFrame frame = new demoframe();
     frame.show();
     class demoframe extends JFrame {
     public demoframe() {
     setSize(300, 500);
     setTitle("Earthquake");
     addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
     System.exit(0);
     Container contentPane = getContentPane();
     canvas = new JPanel();
     contentPane.add(canvas, "Center");
     JPanel p = new JPanel();
     addButton(p, "Start", new ActionListener() {
     public void actionPerformed(ActionEvent evt) {
     rigid b = new rigid(canvas);
     b.start();
     addButton(p, "Close", new ActionListener() {
     public void actionPerformed(ActionEvent evt) {
     canvas.setVisible(false);
     System.exit(0);
     contentPane.add(p, "South");
     public void addButton(Container c, String title, ActionListener a) {
     JButton b = new JButton(title);
     c.add(b);
     b.addActionListener(a);
     private JPanel canvas;
     class rigid extends Thread {
     public rigid(JPanel b) {
     box = b;
     public void draw() {
     Graphics g = box.getGraphics();
     g.fillRect(x, y, XSIZE, YSIZE);
     g.dispose();
     public void move() {
          if (!box.isVisible())
     return;
     Graphics g = box.getGraphics();
     g.setXORMode(box.getBackground());
     g.fillRect(x, y, XSIZE, YSIZE);
     /* int xx; int yy;
     for (int j=1; j<10; j++){
          xx=j*(x-10); yy=j*(y+5);
          g.fillRect(xx,yy,XSIZE, YSIZE);
     x += dx;
     Dimension d = box.getSize();
     if (x < 100) {
     x = 100;
     dx = -dx;
     if (x + XSIZE + 100 >= d.width) {
          x = d.width - XSIZE- 100;
     dx = -dx;
     g.fillRect(x, y, XSIZE, YSIZE);
     g.dispose();
     public void run() {
     try {
     draw();
     for (int i = 1; i <= 1000; i++) {
     move();
     sleep(200);
     } catch (InterruptedException e) {
     private JPanel box;
     private static final int XSIZE = 75;
     private static final int YSIZE = 5;
     private int x = 50;
     private int y = 400;
     private int dx = 2;
     private int dy = 2;
     }

Answer 1

thanks
.. there is a new problem when i run this program.. its meshed animation..
can u plzze advice
package DEMO2;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class DEMO2 {
     public static void main(String[] args) {
     JFrame frame = new demoframe();
     frame.show();
     class demoframe extends JFrame {
     public demoframe() {
     setSize(300, 500);
     setTitle("Earthquake");
     addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
     System.exit(0);
     Container contentPane = getContentPane();
     canvas = new JPanel();
     contentPane.add(canvas, "Center");
     JPanel p = new JPanel();
     addButton(p, "Start", new ActionListener() {
     public void actionPerformed(ActionEvent evt) {
     rigid b = new rigid(canvas);
     b.start();
     addButton(p, "Close", new ActionListener() {
     public void actionPerformed(ActionEvent evt) {
     canvas.setVisible(false);
     System.exit(0);
     contentPane.add(p, "South");
     public void addButton(Container c, String title, ActionListener a) {
     JButton b = new JButton(title);
     c.add(b);
     b.addActionListener(a);
     private JPanel canvas;
     class rigid extends Thread {
     public rigid(JPanel b) {
     building = b;
     public void draw() {
          int x1, x2, y1, y2;
          x1=x+20; x2=x+XSIZE-20; y1=y-(YSIZE); y2=y;     
          Graphics g = building.getGraphics();
          g.fillRect(x, y, XSIZE, YSIZE);
          for(int i=1; i<10; i++ ){
                    x1=x+70; x2=x1+XSIZE-30; y1=y-(i*YSIZE); y2=y;
                         g.drawLine(x1, y1, x1, y2);
                         g.drawLine(x2, y1, x2, y2);
                         g.drawLine(x1, y1, x2, y1);
     public void move(){
          if (!building.isVisible())
               return;
          Graphics g = building.getGraphics();
          g.setXORMode(building.getBackground());
               g.fillRect(x, y, XSIZE, YSIZE);
               g.drawLine(x1, y1, x1, y2);
               g.drawLine(x2, y1, x2, y2);
               g.drawLine(x1, y1, x2, y1);
          x1=x+20; x2=x+XSIZE-20; y1=y-(YSIZE); y2=y;
          x += dx;
          Dimension d = building.getSize();
          if (x < 100) {
               x = 100;
               dx = -dx;
          if (x + XSIZE + 100 >= d.width) {
               x = d.width - XSIZE- 100;
               dx = -dx;
               g.fillRect(x, y, XSIZE, YSIZE);
               for(int i=1; i<10; i++ ){
                    x1=x+20; x2=x+XSIZE-20; y1=y-(i*YSIZE); y2=y;
                         g.drawLine(x1, y1, x1, y2);
                         g.drawLine(x2, y1, x2, y2);
                         g.drawLine(x1, y1, x2, y1);
     public void run() {
          try {
               draw();
               for (int i = 1; i <= 100; i++) {
                    move();
                    sleep(200);
               } catch (InterruptedException e) {
     private JPanel building;
     private static final int XSIZE = 75;
     private static final int YSIZE = 5;
     private int x = 50;
     private int y = 400;
     private int dx = 2;
     private int x1, x2, y1, y2;
     }