编写一个Book类

1 编写一个Book类，该类至少有name和price两个属性。该类要实现Comparable接口，在接口的compareTo（）方法中规定两个Book类实例的大小关系为二者的price属性的大小关系。在主函数中，选择合适的集合类型存放Book类的若干个对象，然后创建一个新的Book类的对象，并检查该对象与集合中的哪些对象相等。查询结果如下图：

package JAVA1;  public class Book implements Comparable<Book>{       String name;      float price;      public Book(String name,float price){          this.name=name;          this.price=price;          }      public String getName() {            return name;        }        public void setName(String name) {            this.name = name;        }        public double getPrice() {            return price;        }        public void setPrice(float price) {            this.price = price;        }             public int compareTo(Book b) {                    if(b.price-this.price==0)                        return 0;                    if(b.price-this.price!=0)                        return 1;                  return -1;             }  }

package JAVA1;import java.util.*;  public class Test {      public static void main(String[] args) {               ArrayList<Book> list = new ArrayList<Book>();                Book book1=new Book("JAVA基础教程",28f);                Book book2=new Book("数据库技术",29f);                Book book3=new Book("C++基础教程",29f);              list.add(book1);                list.add(book2);                list.add(book3);             Iterator<Book> it = list.iterator();             Book book=new Book("《模式识别》",29f);             System.out.println("新书："+book.name+"与下列图书：");             while(it.hasNext())                {                    Book b = it.next();                    if(book.compareTo(b)==0)                       System.out.println(b.name);                  }                System.out.println("价格相同，具体价格为："+book.price+"元");            }    }