图书大厦

开发要求

现在要求模拟一个图书大厦图书管理的程序结构，可以在图书大厦实现某一类图书的上架操作，下架操作，以及关键字模糊查询的操作

注：只考虑类结构，图书属性只关注名字与价格

具体内容

分析：.........

范例：需要定义的是图书标准

interface Book{ // 准备出图书信息

public String getTitle(); // 得到书的名字

public double getPrice();//得到书的价钱

}

范例：定义图书大厦，一个图书大厦要保存有多本书的信息，所以图书大厦应该使用链表

classBookShop{private Link books = new LinkImpl();//表示的是所有的书

public void add(Book book){//上架图书

this.books.add(book);//向链表中保存数据

}public void delete(Book book){//下架图书

this.books.remove(book);

}publicLink search(String keyWord){

Link result= newLinkImpl();

Object[] obj= this.books.toArray();//将所有的数据转变为 Object 数组

for(int x = 0;x < obj.length; x ++){

Book book=(Book)obj[x];if(book.getTitle().contains(keyWord)){ //有此关键字

result.add(book);

}

}returnresult;

}

}

现在有了接口了，下面定义子类的时候只需要实现接口覆写方法即可。程序里面包含有 Link 接口的 remove() 方法

这个方法如果要想正常执行，则需要覆写 equals() 方法

范例：定义计算机类图书

class ComputerBook implementsBook{privateString title;private doubleprice;public ComputerBook(String title,doubleprice){this.title =title;this.price =price;

}public booleanequals(Object obj){if(this ==obj){return true;

}if(obj == null){return false;

}if(!(obj instanceofComputerBook)){return false;

}

ComputerBook b=(ComputerBook)obj;if(this.title.equals(b.title) && this.price ==b.price){return true;

}return false;

}publicString getTitle(){return this.title;

}public doublegetPrice(){return this.price;

}publicString toString(){return "【计算机类图书】名称 = "+this.title+",价格 = "+this.price;

}

}

范例：定义数字类图书

class MathBook implementsBook{privateString title;private doubleprice;public MathBook(String title,doubleprice){this.title =title;this.price =price;

}public booleanequals(Object obj){if(this ==obj){return true;

}if(obj == null){return false;

}if(!(obj instanceofMathBook)){return false;

}

MathBook b=(MathBook)obj;if(this.title.equals(b.title) && this.price ==b.price){return true;

}return false;

}publicString getTitle(){return this.title;

}public doublegetPrice(){return this.price;

}publicString toString(){return "【数学类图书】名称 = "+this.title+",价格 = "+this.price;

}

}

范例：进行代码的测试

interfaceLink{

}class LinkImpl implements Link{ //外部的程序只关心此类

}interface Book{//准备出图书信息

public String getTitle(); //得到书的名字

public double getPrice();//得到书的价钱

}classBookShop{private Link books = new LinkImpl();//表示的是所有的书

public void add(Book book){//上架图书

this.books.add(book);//向链表中保存数据

}public void delete(Book book){//下架图书

this.books.remove(book);

}publicLink search(String keyWord){

Link result= newLinkImpl();

Object[] obj= this.books.toArray();//将所有的数据转变为 Object 数组

for(int x = 0;x < obj.length; x ++){

Book book=(Book)obj[x];if(book.getTitle().contains(keyWord)){ //有此关键字

result.add(book);

}

}returnresult;

}

}class ComputerBook implementsBook{privateString title;private doubleprice;public ComputerBook(String title,doubleprice){this.title =title;this.price =price;

}public booleanequals(Object obj){if(this ==obj){return true;

}if(obj == null){return false;

}if(!(obj instanceofComputerBook)){return false;

}

ComputerBook b=(ComputerBook)obj;if(this.title.equals(b.title) && this.price ==b.price){return true;

}return false;

}publicString getTitle(){return this.title;

}public doublegetPrice(){return this.price;

}publicString toString(){return "【计算机类图书】名称 = "+this.title+",价格 = "+this.price;

}

}class MathBook implementsBook{privateString title;private doubleprice;public MathBook(String title,doubleprice){this.title =title;this.price =price;

}public booleanequals(Object obj){if(this ==obj){return true;

}if(obj == null){return false;

}if(!(obj instanceofMathBook)){return false;

}

MathBook b=(MathBook)obj;if(this.title.equals(b.title) && this.price ==b.price){return true;

}return false;

}publicString getTitle(){return this.title;

}public doublegetPrice(){return this.price;

}publicString toString(){return "【数学类图书】名称 = "+this.title+",价格 = "+this.price;

}

}public classactualCombat{public static voidmain(String args[]){

BookShop shop= newBookShop();

shop.add(new ComputerBook("java开发",79.0));

shop.add(new ComputerBook("java数据库编程",69.0));

shop.add(new ComputerBook("java网络编程",76.0));

shop.add(new ComputerBook("数学与java",59.0));

shop.add(new ComputerBook("java与线性代数",49.0));

shop.add(new ComputerBook("网络数学",29.0));

shop.delete(new ComputerBook("java数据库编程",69.0)); //下架操作

Link tepm = shop.search("java"); //模糊查询

Object obj[] = tepm.toArray(); //变为对象数组

for(int x = 0;x < obj.length;x ++){

System.out.println(obj[x]);

}

}

}

这样的程序模型可以在生活中不断演变，例如：一个公园可以有很多的树，种树和砍

一个停车场里可以停放轿车，卡车，电动车

总结

这样的操作模型之中，对于链表只是使用

本程序是以接口为主的编程操作，这种形式在开发中随处可见