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能够游走于聚合内的每一个元素,同时还可以提供多种不同的遍历方式。
Book.java
package com.soyoungboy.iterator2; public class Book { private String ISBN; private String name; private double price; public Book(String isbn, String name, double price) { ISBN = isbn; this.name = name; this.price = price; } public String getISBN() { return ISBN; } public void setISBN(String isbn) { ISBN = isbn; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } public void display() { System.out.println("ISBN=" + ISBN + ",name=" + name + ",price" + price); } }
抽象迭代器Iterator.java
public interface Iterator { boolean hasNext(); Object next(); void remove(); }
具体迭代器Itr 具体聚合类BookList.java
package com.soyoungboy.iterator2; import java.util.ArrayList; import java.util.List; public class BookList { private List<Book> bookList; private int index; public BookList() { bookList = new ArrayList<Book>(); } //添加书籍 public void addBook(Book book) { bookList.add(book); } //删除书籍 public void deleteBook(Book book) { int bookIndex = bookList.indexOf(book); bookList.remove(bookIndex); } public Iterator Iterator() { return new Itr(); } /** * 具体迭代器 * @author soyoungboy * */ private class Itr implements Iterator{ public boolean hasNext() { if(index >= bookList.size()) { return false; } return true; } public Object next() { return bookList.get(index++); } public void remove() { } } }
测试代码类:MainClass.java
package com.soyoungboy.iterator2; public class MainClss { public static void main(String[] args) { BookList bookList = new BookList(); Book book1 = new Book("010203", "Java编程思想", 90); Book book2 = new Book("010204", "Java从入门到精通", 60); bookList.addBook(book1); bookList.addBook(book2); Iterator iter = bookList.Iterator(); while (iter.hasNext()) { Book book = (Book) iter.next(); book.display(); } } }
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原文地址:http://www.cnblogs.com/androidsuperman/p/4856016.html