How to run a Java Class from scratch

[Neo]

I had to write a Java program to help a member of ours. I didn't touch Java after 2003 and I couldn't remember the essential settings. So I had to surf the net to find out how we can compile and run a Java class file. So I thought it would be better to add a quick guide to do this from scratch.

1. Download Java Development Kit (JDK).
2. Set paths - You better copy below code to a batch file (.bat) to run before compiling and running a Java program.

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   set path=C:\Java\jdk1.6.0_20\bin
   set CLASSPATH=.;C:\Java\jdk1.6.0_20\lib
   set JAVA_HOME=C:\Java\jdk1.6.0_20
   

3. Compile a Java program - use following command

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   C:\Java\jdk1.6.0_20\bin\javac.exe Hello.java

   Sample Java code is give below. Save following contents to Hello.java

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   public class Hello {
        public static void main(String argv[]) {
             System.out.println("Hello world !");
        }
   }
   

   After this step, you can see a file named as Hello.class
4. Running the class file - use following command

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   C:\Java\jdk1.6.0_20\bin\java.exe Hello.class

That's it! I hope you will be able to run your first Java program.

[Nipuna]

Neo friend

I did as this

http://www.java.com/en/download/help/path.xml

http://www.ehow.com/how_5127784_set-java-path.html


Then I don't have to Type Java Compiler Path again and again.

We can use Simple by typing

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javac 

in Command Prompt

If some one wants more info Just search on Google like this " set java path "

I added this to Help for others and Not tried to Show that I Know More than You. Don't misunderstand Me !