迭代器模式【Iterator Pattern】

迭代器模式的实现与应用

最新推荐文章于 2025-09-16 12:16:59 发布

原创最新推荐文章于 2025-09-16 12:16:59 发布 · 95 阅读

0 ·

CC 4.0 BY-SA版权

设计模式专栏收录该内容

11 篇文章

订阅专栏

本文详细介绍了迭代器模式的实现方式，并通过一个简单的例子展示了如何使用迭代器模式来遍历产品列表。

不多说了，直接贴代码

interface Iproduct
	{
		public void Add(String Name);
		public String GetProductInfo();

		public IproductIterator iterator();
	}


	interface IproductIterator extends Iterator
	{
	}

	class productIterator implements IproductIterator
	{
		private ArrayList<Iproduct> productList = new ArrayList<Iproduct>();

		private int currentItem = 0;
		public boolean hasNext() 
		{
			boolean b = true;
			if(currentItem >= productList.size() ||productList.get(currentItem) == null )
			{
				b = false;
			}

			return b;
		}

		public void remove()
		{
		}

		public productIterator(ArrayList<Iproduct> list)
		{
            productList = list;
		}


		public Iproduct next()
		{
			return (Iproduct)this.productList.get(this.currentItem++);
		}
	}

	class Product implements Iproduct
	{
		private ArrayList<Iproduct> projectList = new ArrayList<Iproduct>(); 

		private String _name = "";
		private Product(String name)
		{
           _name = name;
		}

		public Product()
		{}

		public void Add(String name)
		{
			this.projectList.add(new Product(name) );
		}

		public String GetProductInfo()
		{
			String info = "";
			return "产品名称是："+_name;
		}

		public  IproductIterator iterator()
		{
			return new productIterator(projectList);
		}


	}

	class design_Pattern_Iterator_Pattern_Client
	{
		public void design_Pattern_Iterator_Pattern_Client_Test()
		{
			Iproduct pro = new Product();
			pro.Add("pro1");
			pro.Add("pro2");
			pro.Add("pro3");
			pro.Add("pro4");

			for (int i=0;i<100 ;i++ )
			{
				pro.Add("Product"+i);
			}

			IproductIterator iter = pro.iterator();
			while (iter.hasNext())
			{
				Iproduct p  = (Product)iter.next();
				System.out.println(p.GetProductInfo());

			}


		}
	}