Exception in the topic "main" java.lang.NoSuchMethodError: main

Question

when i try to compile this:

public class Risk { } class territory { public static void main (String[]arg) { System.out.println ("hi") ; } } 

I get this error message:

 Exception in thread "main" java.lang.NoSuchMethodError: main 

What's going on here?

Answer 1

That the answer ended is that the run class I should contain main , otherwise it will not work. I am posting this because, although other answers give roughly the same information, they do not make it explicit.

Answer 2

The class containing the main() function must be public, and you can define only one public class for each file. You want to have two separate files Risk.java and Territory.java .

Risk.java:

 public class Risk { } 

Territory.java:

 public class Territory { public static void main (String[]arg) { System.out.println ("hi") ; } } 

EDIT: it turns out that this is not true - I was able to run your source code using the following command line:

 java territory 

But my previous comments point to best practice for a real application, for example, for the game Risk.

Answer 3

What class are you trying to run? If you use the territory class, this will work. Risk does not have a main method.

Answer 4

Can you understand why this example is causing the same problem?

 public class Simple { public void main(String args[]) { System.out.println("Inside function"); } } 

Answer: because main () must be publicly available static void!

Answer 5

Could this just be a question? Your original message does not show a space between ']' and 'arg'.

Try the following:

 public static void main (String[] arg) 

or if this still does not work:

 public static void main (String arg[])