Java - Main class not found

From Global Programming Syntax

Below is an example script that will have this bug with some IDE's:

public class filename {
    public void main(String[] args) {
        // TODO code application logic here
    }
}

A very basic bug which can be easily be solved. To solve the error in the above script, the main method/function must be static. So below is how the main method/function should always be:

public class filename {
    public static void main(String[] args) {
        // TODO code application logic here
    }
}

The reason. Your IDE cannot detect the main class since it is not global. And if the main class is not global it can not be globally detected.