Compile and execute java

Hello
is it possible to execute a .class file which is n an other directory without changing directory ?
E:\FAC\PROJET\Demo>javac HelloWord.java
E:\FAC\PROJET\Demo>java HelloWord
Hello Word
E:\FAC\PROJET\Demo>cd..
E:\FAC\PROJET>java E:\FAC\PROJET\Demo\HelloWord
Exception in thread "main" java.lang.NoClassDefFoundError: E:\FAC\PROJET\Demo\HelloWord
E:\FAC\PROJET>How should I do ?
In fact my problem is that I have made a simple Java editor which can compile en run java code. When I open a java file which is situated somewhere on the drive, and I try to compile it works:
javac /somwhere/on/the/direve/myFile.javaBut it seems it is not possible to execute n this way.
My app is of course using runtime.exec(command); class to run the command.
do you have any ideas ?
Thank you !

Try java -classpath %CLASSPATH%;.
HelloWord
For executing the class with the absolute path, use
java -classpath %CLASSPATH%;C:\Foo\Bar HelloWordwhere C:\Foo\Bar contains the class file. :)

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