图解设计模式-Abstract Factory模式

public abstract class Item {
    protected String caption;

    public Item(String caption) {
        this.caption = caption;
    }

    public abstract String makeHTML();
}

public abstract class Link extends Item{

    protected String url;

    public Link(String caption,String url) {
        super(caption);
        this.url = url;
    }
}

public abstract  class Tray extends Item {

    protected List trayList = new ArrayList();

    public Tray(String caption) {
        super(caption);
    }

    public void add(Item item) {
        trayList.add(item);
    }
}

public abstract class Page{
    protected String author;
    protected String title;
    protected List content = new ArrayList();

    public Page(String author,String title) {
        this.title = title;
        this.author = author;
    }

    public void add(Item item){
        content.add(item);
    }

    public void out() {
        String filename = "D:\\"+title+".html";
        try {
            PrintWriter printWriter = new PrintWriter(new FileWriter(filename));
            printWriter.println(this.makeHTML());
            printWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public abstract String makeHTML();

}

public abstract class Factory {
    public static Factory getFactory(String classname) {
        Factory factory = null;
        try {
            factory = (Factory) Class.forName(classname).newInstance();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        }
        return factory;
    }

    public abstract Link createLink(String caption,String url);
    public abstract Tray createTray(String caption);
    public abstract Page createPage(String author,String title);
}

public class ListLink extends Link {
    public ListLink(String caption, String url) {
        super(caption, url);
    }

    @Override
    public String makeHTML() {
        return "<li><a href=\""+url+"\">"+caption+"</a><li>\n";
    }
}

public class ListTray extends Tray {
    public ListTray(String caption) {
        super(caption);
    }

    @Override
    public String makeHTML() {
        StringBuilder builder = new StringBuilder();
        builder.append("\n");
        Iterator iterator = trayList.iterator();
        while(iterator.hasNext()){
            Item item = (Item) iterator.next();
            builder.append(item.makeHTML());
        }
        return builder.toString();
    }
}

public class ListPage extends Page {
    public ListPage(String author, String title) {
        super(author, title);
    }

    @Override
    public String makeHTML() {
        StringBuilder builder = new StringBuilder();
        builder.append(title);
        builder.append(author);
        Iterator iterator = content.iterator();
        while(iterator.hasNext()) {
            Item item = (Item) iterator.next();
            builder.append(item.makeHTML());
        }
        return builder.toString();
    }
}

public class ListFactory extends Factory {

    @Override
    public Link createLink(String caption, String url) {
        return new ListLink(caption, url);
    }

    @Override
    public Tray createTray(String caption) {
        return new ListTray(caption);
    }

    @Override
    public Page createPage(String author, String title) {
        return new ListPage(author,title);
    }
}

public class Main {
    public static void main(String[] args) {
        Factory factory = ListFactory.getFactory("listfactory.ListFactory");
        Link link = factory.createLink("111","222");
        Tray tray = factory.createTray("33");
        Page page = factory.createPage("作者","标题");
        page.add(link);
        page.add(tray);
        page.out();
    }
}