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public class HelloWorld{

     public static void main(String []args){
        CD theCD = new CD("Katy Perry - Dab", 5);
        theCD.printTitle();
        theCD.printPages();

        Library lib = new Library();
        lib.setItem(theCD);
        lib.printTitle();

        CD cd2 = (CD) lib.getItem();
        cd2.printPages();
     }
}

class LibraryItem {

    private String title;

    public LibraryItem(String title){
        this.title = title;
    }

    public void printTitle(){
        System.out.println(this.title);
    }
}

class CD extends LibraryItem {

    private int pages;

    public CD (String title, int pages){
        super(title);
        this.pages = pages;
    }

    public void printPages(){
        System.out.println(this.pages);
    }

}

class Library {

    LibraryItem item = null;

    public void setItem(LibraryItem item){
        this.item = item;
    }

    public void printTitle(){
        this.item.printTitle();
    }

    public LibraryItem getItem(){
        return this.item;
    }

}