How do I run .class files on windows from command line?

Question

Hi!

I'm trying to run .class file from command line. It works when I manually move to the directory it's stored in, but when I try something like this:

java C:\Peter\Michael\Lazarus\Main

it says it can't find the main class. Is there any solution to this other than making a .jar file (I know that .jar is the best solution, but at this moment isn't the one I'm looking for)?

Answer 1

The Java application launcher (a.k.a java.exe or simply java) expects a class name as its argument, so you can't pass it a file name (especially not one that includes a directory.

You can tell it where to look for that class by using the -classpath option (or its short form -cp) however:

java -classpath C:\Peter\Michael\Lazarus\ Main

Answer 2

Try this:

java -cp C:\Peter\Michael\Lazarus Main

You need to define the classpath.

Answer 3

Assuming that Main.class does not have a package declaration:

java -cp C:\Peter\Michael\Lazarus\  Main

Java looks for classes in a "classpath", which can be set on the command line via the -cp option.