problem in writting a hello world programme [closed]

Question

Error: Main method not found in the file, please define the main method as: public static void main(String[] args)enter image description here

Answer 1

S should be uppercase in both String and System.

public class Program
{
    public static void main(String[] args) {
       System.out.println("Hello world");
    }
}

Answer 2

public class FirstClass 
{
    public static void main(String[] args) {
       System.out.println("Hello world");
    }
}

String is an immutable class in Java and S should be capital --> String System is also a class name and S should be capital --> System