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| import java.util.*; | |
| public class Library | |
| { | |
| public List<String> filterBooks(HashMap<String, Boolean> library, IBookFilter bookFilter) | |
| { | |
| List<String> filteredBooks = new ArrayList<String>(); | |
| for (Map.Entry<String, Boolean> entry : library.entrySet()) | |
| { | |
| String bookTitle = entry.getKey(); | |
| if (bookFilter.keep(bookTitle, entry.getValue()) | |
| filteredBooks.add(bookTitle); | |
| } | |
| return filteredBooks; | |
| } | |
| public void printBooks(String listTitle, List<String> books) | |
| { | |
| System.out.println(listTitle); | |
| System.out.println("-------------------------------"); | |
| if (books.isEmpty()) | |
| System.out.println("No books to display!"); | |
| for (String book : books) | |
| System.out.println(book); | |
| System.out.println(""); | |
| } | |
| public interface IBookFilter | |
| { | |
| boolean keep(String book, boolean finished); | |
| } | |
| public static void main(String[] args) | |
| { | |
| // Filter to get only finished books | |
| IBookFilter finishedFilter = new IBookFilter() | |
| { | |
| public boolean keep(String book, boolean finished) | |
| { | |
| return finished; | |
| } | |
| }; | |
| // Filter to get only unfinished books | |
| IBookFilter unfinishedFilter = new IBookFilter() | |
| { | |
| public boolean keep(String book, boolean finished) | |
| { | |
| return !finished; | |
| } | |
| }; | |
| // Filter to get only books with the word "the" in the title | |
| IBookFilter booksWithTheFilter = new IBookFilter() | |
| { | |
| public boolean keep(String book, boolean finished) | |
| { | |
| return book.toLowerCase().contains("the"); | |
| } | |
| }; | |
| HashMap<String, Boolean> myBooks = new HashMap<String, Boolean>; | |
| myBooks.put("Road Down the Funnel", true); | |
| myBooks.put("Rat: A Biology", false); | |
| myBooks.put("The Wizard of Oz", false); | |
| myBooks.put("TimeIn", true); | |
| myBooks.put("3D Food Printing", false); | |
| Library myLibrary = new Library(); | |
| List<String> finishedBooks = myLibrary.filterBooks(myBooks, finishedFilter); | |
| List<String> unfinishedBooks = myLibrary.filterBooks(myBooks, unfinishedFilter); | |
| List<String> booksWithThe = myLibrary.filterBooks(myBooks, booksWithTheFilter); | |
| myLibrary.printBooks("Finished Books", finishedBooks); | |
| myLibrary.printBooks("Unfinished Books", unfinishedBooks); | |
| myLibrary.printBooks("Books with the word \"the\"", booksWithThe); | |
| } | |
| } |
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