import java.util.*;

public class Library{

  public Library(){
    }

 public void getFinishedBooks(HashMap<String, Boolean> library){
 if (library.size() < 1){
   System.out.println("Error the HashMap is empty");
 }

   else {
     for (String book : library.keySet()){
       if (library.get(book) == true){
         System.out.println (book);
 			}
     }
   }
 }

 public static void main(String[] args)
 {

 HashMap<String, Boolean> myBooks = new HashMap<String, Boolean>();

     myBooks.put("Road Down the Funnel", true);
     myBooks.put("Rat: A Biology", false);
     myBooks.put("TimeIn", true);
     myBooks.put("3D Food Printing", false);

  Library myLibrary = new Library();

     myLibrary.getFinishedBooks(myBooks);


   }
}