bookmarklist.java

书籍"Java_面向事件编程"的附带光盘代码

import java.io.*;

// class to handle a list of bookmarks
// the bookmarks can be saved to a file
public class BookmarkList {

    private EmptyBookmarks list;  // the list of bookmarks

    public BookmarkList( ){
        list = new EmptyBookmarks();
    }

    // return the number of bookmarks in the list
    public int size( ){
        return list.getSize();
    }

    // return the bookmark at index 
    public Bookmark getSelectedItem( int index ){
        return list.getSelectedItem( size() - (index + 1) );
    }
    
    // add a bookmark to the list
    public void add( Bookmark entry ){
        list = list.add(entry);
    }
    
    // Print all bookmark entries
    public void printBookmarks()
    {
        for ( int i = 0; i < size(); i++) {
            System.out.println( getSelectedItem(i).toString() );
        }
    }
    
    // Place all bookmark entries in bookmarks.html
    public void saveBookmarksFile() {
        
        try {
            FileWriter bookmarksFile = new FileWriter("bookmarks.html");
            
            for ( int i = 0; i < size(); i++) {
                bookmarksFile.write( getSelectedItem(i).toString());
            }
            
            bookmarksFile.close();
        } catch ( IOException e) {
            System.out.println("Unable to access bookmarks file - " + e.getMessage()); 
        }
    }
    
    
}