CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@rosario.n • 11 Oct, 2008 • 1 like
Create a java program to display the moving car using Applet concept....
@Ashutosh_shukla • 30 Nov, 2008 • 2 likes The java file code is as follows:
It shows 4 cars crossing a square.
import java.awt.*;
import java.util.*;
import java.applet.*;
/*
 <APPLET CODE="Animation.JAVA" WIDTH=400 HEIGHT=300>
 </APPLET>
*/
//The basic applet class.The applet shows 4 cars crossing each other at a square.
public class Animation extends Applet implements Runnable
{
 Thread t;
 //4 variables used to vary the car's positions.
 int x1=0,x2=380,y1=50,y2=250;
 public void start()
 {
  if(t==null)
  {
   t=new Thread(this,"New Thread");//New side Thread created on start of applet.
   t.start();
  }
 }
 public void stop()
 {
  if(t!=null)
  {
   t=null;//On stop of applet the created thread is destroyed.
  }
 }
 //Implementation of method run() of Runnable interface.
 public void run()
 {
  Thread t1=Thread.currentThread();
  while(t==t1)
  {
   repaint();
   try
   {
    Thread.sleep(100);
   }
   catch(Exception e)
   {   }
  }
 }
 public void paint(Graphics g)
 {
  setBackground(Color.cyan);
  g.setColor(Color.BLACK);
  x1=(x1+16)%400;
  x2=x2-16;
  y1=(y1+12)%300;
  y2=y2-12;
  if(y2<0)
   y2=288;
  if(x2<0)
   x2=384;
  //Draw the roads using 2 filled rectangles using black color.
  g.fillRect(0,130,400,40);
  g.fillRect(180,0,40,305);
  //Draw the white colored lines.
  g.setColor(Color.white);
  for(int i=0;i<20;i++)
  {
   if(i!=9 && i!=10)
    g.drawLine(i*20,150,i*20+10,150);
  }
  for(int j=0;j<15;j++)
  {
   if(j!=7 && j!=8)
    g.drawLine(200,j*20,200,j*20+10);
  }
  //Draw 4 colored cars using filled round rectangles.
  g.setColor(Color.red);
  g.fillRoundRect(x2,152,20,8,2,2);
  g.fillRoundRect(x1,140,20,8,2,2);
  g.fillRoundRect(190,y1,8,20,2,2);
  g.fillRoundRect(202,y2,8,20,2,2);
 }
}
@lano51 • 08 Jan, 2009 i take this code and try to run it on java but it doesnot run since it doesnot contain the main method that runs the program please can you send me the runnable code.thanks
@Ashutosh_shukla • 08 Jan, 2009 Hey it is an applet you don't have to run it as Java application
Instead you have to view it using the appletviewer
@rosario.n • 09 Jan, 2009 😕 i also tried that program.there is error in the class declaration.


@Ashutosh_shukla • 09 Jan, 2009 • 1 like Hey you save it as Animation.java and try again if it does not work out still send me actual error i will see because it runs perfectly on my pc
@lano51 • 10 Jan, 2009 hi i try again to run this applet but their is an error 😔 please send me step by step what should i do inorder to run this applet please reply as soon as possible as you can.thanks
@Ashutosh_shukla • 10 Jan, 2009 Hey listen you copy the code and store it in a file Animation.java
Next thing is to compile it with the jdk and then kepp the .class file in folder of bin. Now on comand prompt type
appletviewer Animation
@lano51 • 12 Jan, 2009 hi again i face another problem i try to apply what you wrote but i donot know what is meant by jdk and the .class i donot have it, more over where is the location of the bin in the computer .
i create a file and name it animation.java but the rest of the steps i donot know how to apply it .so please send me the code in a zip file on my mail :
lola1985_491@hotmail.com
thank you very much for helping me 😁
@Ashutosh_shukla • 12 Jan, 2009 Hey listen you don't know jdk i mean it is same as the java installed on your machine.It has a bin folder and on compilation of a .java file you get a .class file created.Now simply you have to put this file in your bin and then compile it then you will get a Animation.class file.Then simply you have to use appletviwer command to view the applet.The bin folder contains an application file appletviewer.You need to go to command prompt and then write this command appletviewer Animation
Thats it it will run I guess you have never used java and compiled programs on command line interpreter. Try it once again i have already given you the code you just need to execute this steps properly
@rosario.n • 24 Jan, 2009 hey..i tried again.there is no error..but,i didn't get the car image..😕
@shalini_goel14 • 01 Feb, 2009
rosario.n
hey..i tried again.there is no error..but,i didn't get the car image..😕
Hey rosario,

This code is working absolutely fine for me. Well done Mr. Ashutosh 😀

@rosario: Did you get the applet window? If not even that, follow the steps told by Mr. Ashutosh to run the program.😀
@rama_krish627 • 07 Feb, 2009 Ya it's working ya. I got a moving cars in red color.
@zia.sepsis • 01 Aug, 2009
lano51
hi again i face another problem i try to apply what you wrote but i donot know what is meant by jdk and the .class i donot have it, more over where is the location of the bin in the computer .
i create a file and name it animation.java but the rest of the steps i donot know how to apply it .so please send me the code in a zip file on my mail :
lola1985_491@hotmail.com
thank you very much for helping me 😁
Jdk stands for java developing kit... which is an open source software developed by sun microsystem. only with the help of jdk the java source code is compiled into java byte code with the extension of (.class). the command instructing JDK to compile is "javac".
do the following:
1.Copy the above source code and paste it in a notepad.
2.save it with the "class name" i.e."Animation" with an extension (.java) (note: java is case sensitve)
3.For instance your saving this in a folder named "david" in your "c:", now open your "cmd" and type as following.
c:\documents and settings\user name> cd\
c:\> cd david
c:\david>
" you have located the desired directory now"
c:\david> javac Animation.java
c:\david>
(this denotes successfull execution of the program)
(please be sure that you have already installed jdk)
4. now "javac" instructs JDK to compile the given source code in java byte code with an extension of (.class). this compiled code will be saved in the same folder.
5. applets cannot be run'd as application because it doesn't hold's any main method. so it has to done by using appletviewer.
6. In order to run an applet you have to write an HTML document and include the applet into that.
<html>
<head>
<title> Display name applet </title>
</head>
<body>
<h1 align=center> Name web applet</h1>
<center>
<applet name="Animation" code="Animation.class" width=200 height=100></applet>
</center>
</body>
</html>
7. save it with an extension (.html)....in the folder david.
8. now--->
c:/david>appletviewer Animation.html
@zia.sepsis • 01 Aug, 2009 Its working.....😎
@spp • 01 Aug, 2009 i tried this code but its not working.
it showing an error that applet not initialized.
so can u please check this out
@zia.sepsis • 01 Aug, 2009
spp
i tried this code but its not working.
it showing an error that applet not initialized.
so can u please check this out
Have you installed JDK?????
@spp • 02 Aug, 2009
zia.sepsis
Have you installed JDK?????
yah i have installed jdk1.6
@zia.sepsis • 02 Aug, 2009
spp
yah i have installed jdk1.6
Try this:
c:\foldername>set path="directory of the jdk's bin";
eg:
"set path=c:\program files\java\jdk.1.5.0-06\bin;"
@spp • 02 Aug, 2009 yah i have already set that path
other applet applications are working but this one not
@Srikz • 21 Aug, 2009

Actually, inside the program the applet code must contain the class file and not the java file.

@sookie • 21 Aug, 2009 Hi Srikz,

That program works if I use neither .java nor .class

Step # 1: Create a folder named "I:\JavaSrcCode" in your local
Step # 2: Open notepad, copy the program in this thread in it and save it as Animation.java in I:\JavaSrcCode folder. Also edit Animation.JAVA to simply Animation in Animation.java file.So final file would look like this
import java.awt.*;
import java.util.*;
import java.applet.*;
/*
 <APPLET CODE="Animation" WIDTH=400 HEIGHT=300>
 </APPLET>
*/
//The basic applet class.The applet shows 4 cars crossing each other at a square.
public class Animation extends Applet implements Runnable
{
 Thread t;
 //4 variables used to vary the car's positions.
 int x1=0,x2=380,y1=50,y2=250;
 public void start()
 {
  if(t==null)
  {
   t=new Thread(this,"New Thread");//New side Thread created on start of applet.
   t.start();
  }
 }
 public void stop()
 {
  if(t!=null)
  {
   t=null;//On stop of applet the created thread is destroyed.
  }
 }
 //Implementation of method run() of Runnable interface.
 public void run()
 {
  Thread t1=Thread.currentThread();
  while(t==t1)
  {
   repaint();
   try
   {
    Thread.sleep(100);
   }
   catch(Exception e)
   {   }
  }
 }
 public void paint(Graphics g)
 {
  setBackground(Color.cyan);
  g.setColor(Color.BLACK);
  x1=(x1+16)%400;
  x2=x2-16;
  y1=(y1+12)%300;
  y2=y2-12;
  if(y2<0)
   y2=288;
  if(x2<0)
   x2=384;
  //Draw the roads using 2 filled rectangles using black color.
  g.fillRect(0,130,400,40);
  g.fillRect(180,0,40,305);
  //Draw the white colored lines.
  g.setColor(Color.white);
  for(int i=0;i<20;i++)
  {
   if(i!=9 && i!=10)
    g.drawLine(i*20,150,i*20+10,150);
  }
  for(int j=0;j<15;j++)
  {
   if(j!=7 && j!=8)
    g.drawLine(200,j*20,200,j*20+10);
  }
  //Draw 4 colored cars using filled round rectangles.
  g.setColor(Color.red);
  g.fillRoundRect(x2,152,20,8,2,2);
  g.fillRoundRect(x1,140,20,8,2,2);
  g.fillRoundRect(190,y1,8,20,2,2);
  g.fillRoundRect(202,y2,8,20,2,2);
 }
}
Step #3: Now open command prompt. Switch to your I:\JavaSrcCode directory and enter following command. It will create Animation.class file in the same folder "I:\JavaSrcCode" folder.
javac I:\JavaSrcCode\Animation.java
[​IMG]

Step 4: Now enter following command
appletviewer Animation.java
[​IMG]

You will get applet window finally.

[​IMG]

It has nothing to do with .java and .class until or unless you are keeping your .java and .class files at the same location. Better keep them at same place to avoid any compilications. For large projects only we should keep .class files separately.

Thanks !
@Srikz • 22 Aug, 2009 Hey sookie,
it's just that i happened to compile few other java programs using the .java extenstion in the applet code, which just failed. But it'd work along fine with the class extension. Anyhow, i'll try your method and let you know. Thanks 😀
@HImanshu_Sharma • 23 Mar, 2010 i haven't tried bt i'l actually i had an another programe of this moving car,,,i made myself..so think i can sort out your prob...
@Kavithak • 13 Aug, 2014 Ya ..it works...Thanks a lot..
@v.gowtham • 09 Oct, 2014 in my pc,at the applet page,on the bottom (start:applet not initialised)is displaying whats wrong...........?pls help me......!
@Bharath0bk • 14 Aug, 2015 I/O exception while reading: D:\Mycode\Animation (The system cannot find the fil e specified)
@Bharath0bk • 14 Aug, 2015 I/O exception while reading: D:\Mycode\Animation (The system cannot find the fil e specified)

i am getting this error?
@Aaditya Karankot • 12 Feb, 2016 D:\>AppletViewer a.html
load: class Animation.JAVA not found.
java.lang.ClassNotFoundException: Animation.JAVA
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:211)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:785)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
at sun.applet.AppletPanel.run(AppletPanel.java:368)
at java.lang.Thread.run(Thread.java:662)
@Aashish Chugh • 30 May, 2016 Yeah nice Coding ..

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