It says I dont have a main method , so i cant run the file to get an output Please help?!!and Thank you!!!!

1/ 4 linen 13 public class GrndeBook 14 15 16 17 18 19 private Sering cour selame private String instructorame public OeadeBook (Sering CSCLLO, Sering A1L) 21 courselame CSC110 23 24 25+ 29 30 31 4 line,'/! public void setCoutselame (String CSC11O courselane CSC110 13 35 5 lines public Sering getContseame (Steing CSC110) return courseXanez 47 + 51 52 53 ...4 lines public void setinstructoriane (Sering Ali) 56 .5lines public Secing get Instructolane (Sering Ali) 67 public void displayflessage 74