例7-10.txt

Java大学实用教程 耿祥义编著 课件 PPT

import java.util.*;
class Book 
{
   String ISBN,name;
   Book(String ISBN,String name)
   {
      this.name=name;
      this.ISBN=ISBN;
   }
}
public class Example
{
   public  static void main(String args[])
   { 
      Book book1=new Book("7302033218","C++基础教程"),
           book2=new Book("7808315162","Java编程语言"),
           book3=new Book("7302054991","J2ME无线设备编程");
      HashMap<String,Book> table=new HashMap<String,Book>();
      table.put(book1.ISBN,book1); 
      table.put(book2.ISBN,book2);
      table.put(book3.ISBN,book3);  
      if(table.containsKey("7808315162"))
      {
          System.out.println("C++基础教程有货");
      }
      Book b=table.get("7302054991");
      System.out.println("书名:"+b.name+",ISBN:"+b.ISBN);
      int number=table.size();
      System.out.println("散列映射中有"+number+"个元素:");
      Collection<Book>  collection=table.values();
      Iterator<Book> iter=collection.iterator();
      while(iter.hasNext())
      { 
        Book te=iter.next();
        System.out.printf("书名:%s,ISBN:%s\n",te.name,te.ISBN);
      }
   }
}