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Thread: Brand New/First Attempt

  1. #1
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    Default Brand New/First Attempt

    Ok so I am doing the infamous Hello World App, here is the code:

    public class HelloApp
    {
    public static void main (String[] args)
    {
    System.out.println("Hello, World!");
    }
    }


    What I have done to my system, in the environment variables under system variables I added:
    C:\Program Files (x86)\Java\jdk1.7.0\bin to the Path

    From the command prompt I am able to compile the code with no errors (javac HelloApp.java)

    I am however not able to execute the code with java HelloApp, I get the following error:
    Error: Could not find or load main class HelloApp

    I am however able to execute the code by typing: java -cp . HelloApp
    Last edited by kevinco; August 14th, 2011 at 07:46 PM.


  2. #2
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    Default Re: Brand New/First Attempt

    I have now created a folder on the desktop named "Java" and placed both the class file and the java file in it and copied the java.exe file and placed it in the folder and now I am able to execute the java file from the command prompt, so I'm thinking it definitely has something to do with the path to the java.exe but I edited the path

  3. #3
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    Default Re: Brand New/First Attempt

    No. You should not move the java or javac exe files. Leave them in the bin directory. Also you should not place any of your java files in the bin directory, you should have them in a separate directory somewhere else. So what is wrong with using java -cp . appname if it works?
    Improving the world one idiot at a time!

  4. #4
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    Default Re: Brand New/First Attempt

    Did you set the CLASSPATH environment variable?
    If you didn't have the . there, then you will need to use -cp . on your command line.

    Open a command prompt and enter SET to see what your environment variables are set to.
    To copy the contents of the command prompt window:
    Click on Icon in upper left corner
    Select Edit
    Select 'Select All' - The selection will show
    Click in upper left again
    Select Edit and click 'Copy'

    Paste here.

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