Re: Problem with Timer object

Knute Johnson <>
Mon, 22 Sep 2008 10:49:20 -0700
<48d7da9b$0$28801$> wrote:

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

Your code was still not compilable and I don't have the time to play
with it. I still think you should try a different approach rather than
all the timers. Animation can be tricky to get working well. I wrote
you an example of how I think you should approach your problem. Adding
pauses for door opening/closing should be just a matter of adding some
new states to the Direction enum and some more logic code to the run()
method and paint the doors.

Note: I used the European convention for the floors. The first floor
above the ground floor is 1.

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

public class test99 extends JPanel implements ActionListener, Runnable {
     // start with car on fifth floor
     volatile int Y = 150;
     volatile int floor = 150;
     enum Direction { UP, DOWN, STOP };
     Direction dir = Direction.STOP;

     public test99() {
         setPreferredSize(new Dimension(200,200));

     public void start() {
         new Thread(this).start();

     public void actionPerformed(ActionEvent ae) {
         String ac = ae.getActionCommand();
         if (ac.equals("4")) {
             if (dir == Direction.STOP)
                 floor = 120;
                 if (Y < floor)
                     dir = Direction.UP;
                     dir = Direction.DOWN;
         } else if (ac.equals("G")) {
             if (dir == Direction.STOP) {
                 floor = 0;
                 if (Y > floor)
                     dir = Direction.DOWN;

     public void run() {
         while (true) {
             // 25 frames per second delay
             try {
             } catch (InterruptedException ie) { }

             switch (dir) {
                 case UP: Y += 1; break;
                 case DOWN: Y -= 1; break;
                 case STOP: break;
             // stop car if on correct floor
             if (Y == floor)
                 dir = Direction.STOP;

     public void paintComponent(Graphics g2D) {
         // need Graphics2D for the stroke
         Graphics2D g = (Graphics2D)g2D;
         // draw background
         // draw car
         // draw shaft
         Stroke s = g.getStroke();
         g.setStroke(new BasicStroke(4.0f));
         for (int i=0; i<6; i++)

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 test99 t99 = new test99();
                 JFrame f = new JFrame();
                 JPanel p = new JPanel();
                 JButton b = new JButton("4");
                 b = new JButton("G");


Knute Johnson
email s/nospam/knute2008/

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