Dúvida

class Movie {  
    String title;  
    String genre;  
    int rating;  
      
    void playIt () {  
        System.out.println("Playing the movie");  
    }  
}

public class MovieTestDrive {  
    public static void main (String[] args) {  
        Movie one = new Movie() ;  
        one.title = "Gone with the Stock";  
        one.genre = "Tragic";  
        one.rating = -2;  
        Movie two = new Movie ();  
        two.title = "Lost in Cubicle Space";  
        two.genre = "Comedy";  
        two.rating = 5;  
        two.playIt ();  
        Movie three = new Movie ();  
        three.title = "Byte Club";  
        three.genre = "Tragic but ultimately uplifting";  
        three.rating = 127;  
    }  
}

public class CriandoDuasClassesEmUmSoArquivo {
    
    public static void main(String args[]){
        
        MinhaSegundaClasse minhaSegundaClasse = new MinhaSegundaClasse();
        
        System.out.println("...classe construída!");       
        
    }    
}

class MinhaSegundaClasse{}