how do I run a java program using javaw.exe?

[owen]

javaw.eve and java.exe are located in the C:\Program Files\Java\j2re1.4.2_04\bin directory but every time I try to run it with the code

public  class vm {

   public static void main (String[] args)   {
      System.out.println("Vending Machine");

//print
System.out.println("Hello world");


}

it gives me an error "Could no find main class. Program will exit."
The file is named vm.java how do I get this to work?

[Xenocrates]

You need to include the compile level libraries in the command line, along with the full path to the source code. But why are you doing it the hard way? Don't you have a Java IDE? You could just use that to run your code!

The IDE needs to setup some environment variables that you need to run the code (when the compiler and code are not in the same directory). Outside of this, the java compiler and the code would need to be in the same directory (from my experience).

Are you using a Java IDE? If so which one? If not, why not?

[owen]

I just want to run it. Took me long enough to download, now all I want to do is run it. The files are in the same directory what " include the compile level libraries" do I need to include?

Java IDEs tend to be slow, heavy and odd. I just want to get it running, so that I can see if the synthax is correct.

[RobyG]

[quote author=owen link=board=21;threadid=4695;start=0#msg43398 date=1087778274]
Java IDEs tend to be slow, heavy and odd.
[/quote]

IntelliJ IDEA ain't slow!
Best IDE I have ever come across...packed with features

[dean]

there are two steps involved in running a java program, first you need to compile it using the javac command. then run it using the java command.
1. cd into the directory containing u're source
2. type javac vm.java
3. if there are no errors, you should have a new vm.class file in the dir.
4. java vm : this means call the main method in the vm.class file

[CKnight]

[quote author=owen link=board=21;threadid=4695;start=0#msg43351 date=1087749116]
javaw.eve and java.exe are located in the C:\Program Files\Java\j2re1.4.2_04\bin directory but every time I try to run it with the code

public  class vm {

   public static void main (String[] args)   {
      System.out.println("Vending Machine");

//print
System.out.println("Hello world");


}

it gives me an error "Could no find main class. Program will exit."
The file is named vm.java how do I get this to work?
[/quote]


Remove the "public" keyword from your class declaration.

[owen]

[quote author=Zeus link=board=21;threadid=4695;start=0#msg44645 date=1088488658]
there are two steps involved in running a java program, first you need to compile it using the javac command. then run it using the java command.
1. cd into the directory containing u're source
2. type javac vm.java
3. if there are no errors, you should have a new vm.class file in the dir.
4. java vm : this means call the main method in the vm.class file
[/quote]

where do I get the javac.exe zues?

[alexdevmaster]

it seems to me that you downloade the wrong java distribution, a jre prefix usually means that what you have is the runtime engine, what you really want is the
j2sdk_version_here, that is what you use for development
with that comes the javac.exe that you need to compile java code.

by the way when you do get the sdk, theres a bug in your code, ur missing an extra closing brace (}) at the end of the code to close the class.


then steps to running is as easy as mentioned before
javac <filename>.java
you should see a <filename>.class
then you you just call
java <filename> (without any extensions)

hope this helps

[editor]

Use this link to download an IDE called 'eclipse':

http://www.eclipse.org/downloads/index.php

You find it to be very useful.

[editor]

public class test {

public static void main(String[] args) {
System.out.println("Vending Machine");

// print
System.out.println("Hello world");
}
}