LibraryTester.java

public class LibraryTester {
    public static void main(String[] args){

        BookShelf O=new BookShelf('O');
        BookShelf T=new BookShelf('T');
        System.out.println(O);
        System.out.println(T);
        Book b1=new Book("The Heart of the Betrayed","Crime");
        Book b2=new Book("Our Hill of Stars","Fantasy");
        Book b3=new Book("One of a Kind","Science Fiction");
        Book b4=new Book("The Vision of Roses","Romance");
        System.out.println(b1);
        System.out.println(b2);
        System.out.println(b3);
        System.out.println(b4);
        O.add(b1);
        O.add(b2);
        O.add(b3);
        O.add(b4);
        T.add(b1);
        T.add(b2);
        T.add(b3);
        T.add(b4);
        System.out.println(O);
        System.out.println(T);
        

    }
}