Java类集和接口的应用

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

interface Book {
  public float getPrice();
  public String getName();
  public String getInfo();
}

//书店
class BookShop {
  private String name;
  //一个书店中有多种书 将书放在集合中
  private List<Book> allBooks;
  //无参构造 用于初始化参数
  public BookShop() {
    this.allBooks = new ArrayList<Book>();
  }
  public BookShop(String name) {
    this();
    this.name = name;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public List<Book> getAllBooks() {
    return allBooks;
  }
  public void setAllBooks(List<Book> allBooks) {
    this.allBooks = allBooks;
  }
  //添加书籍
  public void append(Book book) {
    this.allBooks.add(book);
  }
  //删除书籍
  public void delete(Book book) {
    this.allBooks.remove(book);
  }
  //根据书名查找书籍
  public Book findByName(String name) {
    Book book = null;
    Iterator<Book> iter = this.allBooks.iterator();
    while(iter.hasNext()) {
      Book temp = iter.next();
      if(name.equals(temp.getName())) {
        book = temp;
        break;
      }
    }
    return book;
  }
  //检索书籍
  public List<Book> index(String keyWord) {
    List<Book> bList = new ArrayList<Book>();
    Iterator<Book> iter = this.allBooks.iterator();
    while(iter.hasNext()) {
      Book temp = iter.next();
      //如果遍历出的书名中没有包含keyWord的 则返回-1
      if(temp.getName().indexOf(keyWord)!=-1) {
        //将包含搜索关键字的书添加到集合中
        bList.add(temp);
      }
    }
    return bList;
  }
}
//儿童书
class ChildBook implements Book{
  private float price;
  private String name;
  private String info;
  public ChildBook(String name,float price,String info) {
    this.setName(name);
    this.setPrice(price);
    this.setInfo(info);
  }
  public float getPrice() {
    return price;
  }
  public void setPrice(float price) {
    this.price = price;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getInfo() {
    return info;
  }
  public void setInfo(String info) {
    this.info = info;
  }
  public String toString() {
    return "书名："+this.getName()+",简介："+this.getInfo()+",价格："+this.getPrice();
  }
}
//电脑书
class ComputerBook implements Book{
  private float price;
  private String name;
  private String info;
  public ComputerBook(String name,float price,String info) {
    this.setName(name);
    this.setPrice(price);
    this.setInfo(info);
  }
  public float getPrice() {
    return price;
  }
  public void setPrice(float price) {
    this.price = price;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getInfo() {
    return info;
  }
  public void setInfo(String info) {
    this.info = info;
  }
  public String toString() {
    return "书名："+this.getName()+",简介："+this.getInfo()+",价格："+this.getPrice();
  }
}
public class ColDemo {
  public static void main(String[] args) {
    Book b1 = new ChildBook("海底三千里",50.0f,"科幻小说");
    Book b2 = new ChildBook("老鼠捉猫",50.0f,"猫和老鼠的故事");
    Book b3 = new ChildBook("会飞的鲨鱼",50.0f,"这一刻我飞上了天空");
    Book b4 = new ComputerBook("Java咖啡馆",30.0f,"JAVA的咖啡哲学");
    Book b5 = new ComputerBook("Oracle数据库编程",80.0f,"Oracle详解");
    Book b6 = new ComputerBook("UML教程",40.0f,"UML基础教程");
    Book b7 = new ComputerBook("Web开发详解",50.0f,"JavaWeb开发书籍");
    BookShop bs = new BookShop("网上书店");
    bs.append(b1);
    bs.append(b2);
    bs.append(b3);
    bs.append(b4);
    bs.append(b5);
    bs.append(b6);
    bs.append(b7);
    //打印出所有书籍列表
    print(bs.getAllBooks());
    //打印含有关键字的书名列表
    print(bs.index("J"));
    Book book = bs.findByName("会飞的鲨鱼");
    System.out.println(book);
  }
  //打印方法
  public static void print(List all) {
    Iterator iter = all.iterator();
    while(iter.hasNext()) {
      Book b = (Book)iter.next();
      System.out.println(b);
    }
  }
}