how to run java source program in command prompt

You should use NetBeans or Eclipse, when programming in Java - this would solve all your problems.

Java source code has to be compiled into a class file using javac compiler (which is only available in the Java JDK). The compiled class then can be run with the java command.

I did the same.. Getting this error while running it..
C:\Program Files\Sikuli X>java -jar sikuli-script.jar HelloWorld
[error] Can't run this Sikuli script: HelloWorld
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(Unknown Source)
        at org.sikuli.script.ScriptRunner.getPyFrom(ScriptRunner.java:106)
        at org.sikuli.script.ScriptRunner.runPython(ScriptRunner.java:100)
        at org.sikuli.script.SikuliScript.main(SikuliScript.java:111)

Uuups, things are messed up a little bit:

So I guess your "simple sikuli java program in notepad" is a Sikuli script like this:

find("some_image.png")
click("some_other_image.png")
...

which is Jython/Python language (not Java).

When I am right, then you have to name your script:
HelloWorld.py

and wrap it into a folder
HelloWorld.sikuli

together with the images, that might be used in the script.

to run this:
C:\Program Files\Sikuli X>java -jar sikuli-script.jar -r HelloWorld.sikuli

If I am not right, and it is really a Java program, then my comment #1 is applicable and the final usage would be:
C:\Program Files\Sikuli X>java -cp sikuli-script.jar HelloWorld

putting sikuli-script.jar on the class path and running the compiled class file HelloWorld.

Actually this is my code.. when i run it using eclipse it runs properly... when i try to run it in cmd prompt i get those errors.. ya its a simple program i hav just to started learning..

import org.sikuli.script.*;
public class HelloWorldClass {

 public static void main(String[] args)
  {
  float similarity=(float)0.7;
  int timeout=5;
  Pattern Win7StartButton =new Pattern("C:/Users/404905/workspace/HelloWorld/image/Win7StartButton.png");
  Screen screen=new Screen();
  if(screen.exists(Win7StartButton.similar(similarity),timeout)!=null)
   {
   try
   {
       screen.click(Win7StartButton,0);
       screen.type("hello");
       Pattern image =new Pattern("C:/Users/404905/workspace/HelloWorld/image/image.png").similar(similarity);
       screen.click(image);
      }
     catch(FindFailed e)
      {
         e.printStackTrace();
      }
      }

     }
}

Sorry, but this is basic Java programming using Eclipse:

You have to build a jar file in Eclipse, that then is used on command line

java -cp sikuli-script.jar -jar myApp.jar

or you run the compiled java class HelloWorldClass from the projects target path.

ThankU