How to fix error?

Question

Java

import javax.swing.JOptionPane;

class ShowMeAWindowsDemo{
    public static void main (String[] args){
        JOptionPane.showMessageDialog(null,"lol!" );
    }
}

Error: Could not find or load main class showmeawindowapplication.ShowMeAWindowApplication

Answer 1

The class name in Java must exactly match the file name (case sensitive). In your case, the file should be called ShowMeAWindowsDemo.java .
It is also worth checking whether this file is really in the showmeawindowapplication package (folder)