Error java exectuing

Im trying to execute a simple java code (I have already compiled it with no problems) but it gives me the next error:

c:\Users\alejandro\Desktop> java HelloWorld.java Error: Couldn't find or load the main class.

The code is the next:

public class HelloWorld{

    public static void main(String[] args){

        System.out.println("Hello world!");

     }
}

-I have set the PATH variable correctly. -I have deleted CLASSPATH variable. -I have both files (.java and .class) in my Desktop.

Jon Skeet
people
quotationmark

You're specifying the name of the source file. That's not what you provide to the java command - you specify the class name.

java HelloWorld

This assumes that HelloWorld.class is somewhere on the classpath, which would default to "the current directory".

If you had a package, e.g.

package foo;

public class HelloWorld {
    ...
}

Then you would want to put HelloWorld.java in a directory called foo, and compile and run from the root directory:

> javac foo\HelloWorld.java
> java foo.HelloWorld

Note how now the fully-qualified class name is foo.HelloWorld, not foo\HelloWorld.

people

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