迭代器模式：提供一種方法順序訪問一個聚合對象中的各個元素，而又不暴露其內部的表示。
類圖： 
使用迭代器模式，實現了烤魚菜單，類圖： 
MenuItem類代碼實現：
接口Iterator代碼實現：
public interface Iterator { public boolean hasNext(); public Object next(); public void remove();}類FishIterator代碼實現：
public class FishIterator implements Iterator{ MenuItem[] items; int position = 0; public FishIterator(MenuItem[] items){ this.items = items; } @Override public boolean hasNext() { // TODO Auto-generated method stub if (position >=items.length || items[position] == null) { return false; }else { return true; } } @Override public Object next() { // TODO Auto-generated method stub MenuItem menuItem = items[position]; position = position + 1; return menuItem; } @Override public void remove() { // TODO Auto-generated method stub for (int i = position; i < (items.length -1); i++) { items[i] = items[i+1]; } items[items.length - 1] = null; }}接口Menu代碼實現：
public interface Menu { public Iterator createIterator();}類FishMenu代碼實現：
public class FishMenu implements Menu{ MenuItem[] items; static final int MAX_ITEMS = 6; int numberOfItems = 0; public FishMenu(){ items = new MenuItem[MAX_ITEMS]; addItem("烤鯽魚"); addItem("烤草魚"); addItem("烤大頭魚"); addItem("烤秋刀魚"); addItem("烤鯊魚"); } public void addItem(String name){ MenuItem menuItem = new MenuItem(name); if (numberOfItems >= MAX_ITEMS) { System.out.新聞熱點
疑難解答
