Re: Problem with Timer object

Mon, 22 Sep 2008 08:24:58 -0700 (PDT)
Hi , Sorry for that mess . I use tab and space when I typed the code
into the Google window and at the end it displayed like that . My
problem is how to pause the elevator when it reachs a chosen floor
(picked by pressing one button on the button panel). My idea is to
use another Pause( contains another timer ) class to do this . When
the current floor is the destination floor , I use this code segment

new Pause(); // call the pause so that the elevator will pause
             for a short time
tm.start(); // restart Timer tm so that the elevator continues
but it doesn't work . This afternoon when i passed tm into Pause
That means new Pause(Timer tm) and restart the tm inside Pause's
actionPerformed it surprisingly worked . The elevator could pause.
That maked me confused .
I post all of my code here . Thank all for your help and advice .

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

//The main class
public class Elevator_Simulation extends JFrame{
  public JLabel state; // display the state of the elevator
  private JLabel id; //your name and group
  public ButtonPanel control; //the button control panel
  private Elevator elevator; // the elevator area
  private final int width = 400;
  private final int height = 500;
  public Container elevatorPanel;
  private int delay ;

  public Elevator_Simulation() {
  // Create GUI
   setTitle("Elvator Simulation");
   setVisible(true); setDefaultCloseOperation(EXIT_ON_CLOSE);
        elevator = new Elevator(this);


  public void buildPanel(){
   id = new JLabel("MyName SE6",JLabel.CENTER);
        elevatorPanel = getContentPane();
        control = new ButtonPanel();
        elevatorPanel.setLayout(new BorderLayout());
  public ButtonPanel getButtonPanel(){
   return control ;

  // Main method
  public static void main(String[] args) {
  // Create a frame and display it
   new Elevator_Simulation();

} //the end of Elevator_Simulation class

 public class Elevator extends JPanel implements ActionListener {
  private boolean up ; // the elevator is moving up or down
  private int width; // Elevator width
  private int height; // Elevator height
  private int xco; // The x coordinate of the elevator's
                       upper left corner
  private int yco; // The y coordinate of the elevator's
                       upper left corner
  private int dy0; // Moving interval
  private int topy; //the y coordinate of the top level
  private int bottomy; // the y coordinate of the bottom level
  public Timer tm; //the timer to drive the elevator movement
  private final int delay = 200 ;
  private int speed = 40 ;

  private Elevator_Simulation app;
  // Paint elevator area

  public Elevator(Elevator_Simulation app){
    dy0 = 1 ;
   bottomy = getHeight()*7/8;
   yco = bottomy; = app ;
        up = true;
  public void beginOperation(){
   tm = new Timer(delay/speed,this);
  public void paintComponent(Graphics g) {
   width = getWidth()/8;
   height =getHeight()/8;
   for (int i=0;i<=8;i++){
   xco = getWidth()/2;


  //Handle the timer events
  public void actionPerformed(ActionEvent e) {
  height = getHeight()/8;
  int curFloor = 7-yco/height ;
// Check if the curFloor == the destFloor
   if (yco % height == 0 && app.control.bp[curFloor])
    new Pause();
       if (up){
   if (yco>=dy0)
   yco -=dy0;
   else up=false ;
   else {
   if (yco<(getHeight()*7/8-dy0))
   yco +=dy0;
   else up=true;

  class Pause implements ActionListener
   Timer tmpTimer ;
   int times;
   public Pause(){
   int delayTime = delay/speed*50;
   tmpTimer = new Timer(delayTime,this);
   times = 1;

        public void actionPerformed(ActionEvent e) {
            if (times==2){ tmpTimer.stop();
            else times++;

public class ButtonPanel extends JPanel {
  public JButton b[] = new JButton[8]; // 8 Buttons
  public boolean bp[] = new boolean[8]; // the state of
                                    buttons, pressed or not

  public ButtonPanel() {
  //create GUI
   GridLayout gLayout = new GridLayout(8,1);
        for (int i=7;i>=0;i--) {
            b[i] = new JButton("Storey "+(i+1));
            b[i].addActionListener(new ButtonAction());
            bp[i]= false;

  public void restoreButtonState(int i){
   bp[i] = false;

  class ButtonAction extends JFrame implements ActionListener{
   public void actionPerformed(ActionEvent e) {
   //handle the button pressing events
   JButton button = (JButton)e.getSource();
        String actionCommand = e.getActionCommand();
        int num =
      bp[num-1] = true;

} //the end of ButtonPanel class

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