Galera alguém poderia me explicar esses codigos
public class GradeBook {
public void displayMessage(String CourseName)
{
System.out.printf("Welcome to GradeBook \n%s\n" , CourseName);
}
}
import java.util.Scanner;
public class GradeBookTest {
public static void main(String[]args){
Scanner x =new Scanner(System.in);
GradeBook y =new GradeBook();
System.out.println("Entre o nome do curso");
String nameOfCourse = x.nextLine();
System.out.println();
y.displayMessage(nameOfCourse);
}
}