mastahyeti@mastahyeti:~/projects/Java/1_classes$cat GradeBook.java
public class GradeBook {
	public void displayMessage ( String name ) {
		System.out.printf("Hello %s, welcome to my application\n",name);
	}
}


mastahyeti@mastahyeti:~/projects/Java/1_classes$ cat GradeBookTest.java
import java.util.Scanner;
public class GradeBookTest {
	public static void main( String[] args ) {
		Scanner input = new Scanner( System.in );
		String name = input.nextLine();
		GradeBook  myGradeBook = new Gradebook();
		myGradeBook.displayMessage(name);
	}
}