java--面向对象综合案例二（图书馆）

红太狼 2022-06-02 22:46 219阅读 0赞

**Book:**

package library;  
  
  
public class Book \{  
private int id;  
private String name;  
private String author;  
private double price;  
  
public Book(int id, String name, String author, double price) \{  
this.id = id;  
this.name = name;  
this.author = author;  
this.price = price;  
\}  
  
  
public String toString()\{  
return "书号："+this.id+"书名："+this.name+"作者："+this.author+"价格:"+this.price;  
\}  
  
  
  
  
public int getId() \{  
return id;  
\}  
  
  
  
  
public void setId(int id) \{  
this.id = id;  
\}  
  
  
  
  
public String getName() \{  
return name;  
\}  
  
  
  
  
public void setName(String name) \{  
this.name = name;  
\}  
  
  
  
  
public String getAuthor() \{  
return author;  
\}  
  
  
  
  
public void setAuthor(String author) \{  
this.author = author;  
\}  
  
  
  
  
public double getPrice() \{  
return price;  
\}  
  
  
  
  
public void setPrice(double price) \{  
this.price = price;  
\}  
\}

**Manager:**

package library;  
  
  
import java.util.Arrays;  
  
  
public class Manager \{  
Book\[\] books=new Book\[0\];  
int index=0;  
  
public void add(Book book)\{  
books=Arrays.copyOf(books, books.length+1);  
books\[index\]=book;  
index++;  
\}  
public void update(String name,double price)\{  
for(int i=0;i<books.length;i++)\{  
if(books\[i\].getName().equals(name))\{  
books\[i\].setPrice(price);  
\}  
\}  
\}  
  
public Book queryid(int id)\{  
Book book=null;  
for(int i=0;i<books.length;i++)\{  
if(books\[i\].getId()==id)\{  
book=books\[i\];  
\}  
\}  
return book;  
\}  
  
public Book\[\] queryname(String author)\{  
Book\[\] bk=\{\};  
int index=0;  
for(int i=0;i<books.length;i++)\{  
if(author.equals(books\[i\].getAuthor()))\{  
bk=Arrays.copyOf(bk, bk.length+1);  
bk\[index\]=books\[i\];  
index++;  
\}  
\}  
return books;  
\}  
  
  
public void showAll()\{  
for(int i=0;i<books.length;i++)\{  
Book book=books\[i\];  
System.out.println(book.getId()+" "+book.getName()+book.getAuthor()+book.getPrice());  
\}  
\}  
/\*//private Book\[\] books = \{\};//数组  
Book\[\] books=new Book\[0\];  
int index=0;  
public void add(Book book)\{  
books= Arrays.copyOf(books, books.length+1);  
books\[index\]=book;  
index++;  
//for(int i=0;i<books.length;i++)\{  
//books=Arrays.copyOf(books, books.length+1);  
//books\[books.length-1\]=book;  
//\}  
//System.out.println("书号："+super.getId()+"书名："+super.getName()+"作者："+super.getAuthor()+"价格："+super.getPrice());  
\}  
public void update(String name,double price)\{  
for(int i=0; i<books.length;i++)\{ //数组遍历  
Book book =books\[i\];  
if(name.equals(book.getName()))\{  
book.setPrice(price);  
\}  
  
\}  
//for(int i=0;i<books.length;i++)\{  
//if(name.equals(books\[i\]))\{  
//  
//\}  
//\}  
\}  
public Book queryid(int id)\{  
Book book =null;  
for(int i=0; i<books.length;i++)\{  
if(books\[i\].getId()==id)\{  
book=books\[i\];  
\}  
\}  
return book;  
\}  
public Book\[\] queryname(String author)\{  
Book\[\] books1 =\{\};  
int inr = 0;  
for(int i=0; i<books.length;i++)\{  
if(author.equals(books\[i\].getAuthor()))\{  
Book book =books\[i\];  
books1 = Arrays.copyOf(books1, books1.length+1);  
books1\[inr\]=book;  
inr++;  
  
\}  
\}  
return books1;  
\}  
public void showAll()\{  
for(int i=0; i<books.length;i++)\{  
Book book =books\[i\];  
//System.out.println(books\[i\].getId()+books\[i\].getName()+books\[i\].getAuthor()+books\[i\].getPrice());  
System.out.println(book.getId()+" "+book.getName()+" "+book.getAuthor()+" "+book.getPrice());  
\}  
//System.out.println("书号："++"书名："+super.getName()+"作者："+super.getAuthor()+"价格："+super.getPrice());  
\}\*/  
\}

**Test:**

package library;  
  
  
import java.util.Arrays;  
  
  
import org.junit.Test;  
  
  
  
  
public class jTest \{  
  
  
@Test  
public void test()\{  
Manager manager=new Manager();  
Book book1=new Book(1001,"红楼梦","张三",200);  
Book book2=new Book(2002,"西游记","李四",140.50);  
Book book3=new Book(3003,"三国演义","王五",130);  
Book book4=new Book(4004,"水浒传","赵六",83);  
Book book5=new Book(5005,"三个和尚","李四",50);  
  
manager.add(book1);  
manager.add(book2);  
manager.add(book3);  
manager.add(book4);  
manager.add(book5);  
  
manager.showAll();//第一次测试输出  
  
manager.update("西游记", 170);//修改图书价格  
  
  
Book b3003 =manager.queryid(3003); //修改图书编号  
System.out.println(b3003.getName());  
  
Book\[\] totle = manager.queryname("李四");  
System.out.println(Arrays.toString(totle));  
  
manager.showAll(); //修改后等显示全部  
  
  
  
/\*Manager manager =new Manager();  
//Manager\[\] mg=new Manager\[0\];  
//Manager mg1=new Manager(0, null, null, 0);  
Book book1=new Book(1001,"红楼梦","张三",200);  
Book book2=new Book(2002,"西游记","李四",140.50);  
Book book3=new Book(3003,"三国演义","王五",130);  
Book book4=new Book(4004,"水浒传","赵六",83);  
Book book5=new Book(5005,"三个和尚","李四",50);  
manager.add(book1);  
manager.add(book2);  
manager.add(book3);  
manager.add(book4);  
manager.add(book5);  
  
  
manager.update("西游记", 170);//修改图书价格  
  
  
Book b3003 =manager.queryid(3003); //修改图书编号  
System.out.println(b3003.getName());  
  
Book\[\] totle = manager.queryname("李四");  
System.out.println(Arrays.toString(totle));  
  
manager.showAll(); //显示全部  
\*/  
//mg1.add(book1);  
//manager.add(1001,"红楼梦","张三",200);  
/\*for(Book bk:book)\{  
System.out.println("书号："+bk.getId()+" 书名："+bk.getName()+" 作者："+bk.getAuthor()+" 价格："+bk.getPrice());  
\}\*/  
  
//Book\[\] books=\{manager1,manager2,manager3,manager4,manager5\};  
//manager1.add();  
//manager2.add();  
//manager3.add();  
//manager4.add();  
//manager5.add();  
//manager2.update("西游记", 170);  
\}  
\}