• 图书管理系统

    目录

    框架分析：

    Java文件分类：

    代码实现：

    book:

    Book

    BookList

    user 

    父类——User

    子类——管理员 AdminUser

    子类——普通用户 NormalUser

    operations:

    接口IOperation

    AddOperation

    BorrowOperation

    DelOperation

    ExitOperation

    FindOperation

     ReturnOperation 

     ShowOperation

    Main

    运行结果的部分展示：

    框架分析：

     具体实现类是根据用户的需求所添加的

    Java文件分类：

     

    代码实现：

    book:

    Book

    1. package com.book;
    2.  
    3.  
    4. public class Book {
    5.     private String name;//书名
    6.     private String author;//书的作者
    7.     private int price;//书的价格
    8.     private String type;//书的类型
    9.     private boolean isBorrowed;//书是否已借出
    10.     //boolean类型默认是false，默认未被借出
    11.     //构造方法
    12.  
    13.     public Book(String name, String author, int price, String type) {
    14.         this.name = name;
    15.         this.author = author;
    16.         this.price = price;
    17.         this.type = type;
    18.     }
    19.     //get、set方法：
    20.  
    21.     public String getName() {
    22.         return name;
    23.     }
    24.  
    25.     public void setName(String name) {
    26.         this.name = name;
    27.     }
    28.  
    29.     public String getAuthor() {
    30.         return author;
    31.     }
    32.  
    33.     public void setAuthor(String author) {
    34.         this.author = author;
    35.     }
    36.  
    37.     public int getPrice() {
    38.         return price;
    39.     }
    40.  
    41.     public void setPrice(int price) {
    42.         this.price = price;
    43.     }
    44.  
    45.     public String getType() {
    46.         return type;
    47.     }
    48.  
    49.     public void setType(String type) {
    50.         this.type = type;
    51.     }
    52.  
    53.     public boolean isBorrowed() {
    54.         return isBorrowed;
    55.     }
    56.  
    57.     public void setBorrowed(boolean borrowed) {
    58.         isBorrowed = borrowed;
    59.     }
    60.     //打印：
    61.  
    62.     @Override
    63.     public String toString() {
    64.         return "Book{" +
    65.                 "name='" + name + '\'' +
    66.                 ", author='" + author + '\'' +
    67.                 ", price=" + price +
    68.                 ", type='" + type + '\'' +
    69.                 ((isBorrowed==true)?"  已借出":"  未借出 ")+
    70.                 '}';
    71.     }
    72. }

    BookList

    1. package com.book;
    2.  
    3.  
    4. public class BookList {
    5.     public Book[] books=new Book[10];
    6.     public int usedSize;//计数器，记录当前书的本数
    7.  
    8.  
    9.  
    10.     //先存几本书
    11.     public BookList() {
    12.         books[0]=new Book("狼王梦","沈石溪",35,"小说");
    13.         books[1]=new Book("活着","余华",40,"小说");
    14.         books[2]=new Book("三体","刘慈欣",38,"小说");
    15.         this.usedSize=3;
    16.  
    17.     }
    18.     public int getUsedSize() {
    19.         return usedSize;
    20.     }
    21.  
    22.     public void setUsedSize(int usedSize) {
    23.         this.usedSize = usedSize;
    24.     }
    25.     //获取指定位置
    26.     public Book getPos(int pos) {
    27.         return books[pos];
    28.     }
    29.  
    30.     //存放在指定位置,指定位置为，当前可以存放书籍的书架上最后一个位置
    31.     public void setBooks(Book book,int pos) {
    32.         books[pos]=book;
    33.     }
    34. }

    user 

    父类——User

    1. package com.user;
    2.  
    3. import com.book.BookList;
    4. import com.operations.IOperation;
    5.  
    6.  
    7. public abstract class User {
    8.     protected String name;
    9.     protected IOperation[] iOperations;//定义数组，不初始化
    10.  
    11.     public User(String name) {
    12.         this.name=name;
    13.     }
    14.     public abstract int menu();
    15.     public void doOperation(int choice, BookList bookList){
    16.         iOperations[choice].work(bookList);
    17.     }
    18. }

    子类——管理员 AdminUser

    1. package com.user;
    2.  
    3. import com.operations.*;
    4.  
    5. import java.util.Scanner;
    6.  
    7. public class AdminUser extends User{
    8.     public AdminUser(String name) {
    9.         super(name);
    10.         this.iOperations=new IOperation[]{
    11.                 new ExitOperation(),
    12.                 new FindOperation(),
    13.                 new AddOperation(),
    14.                 new DelOperation(),
    15.                 new ShowOperation()
    16.         };
    17.     }
    18.  
    19.     public int menu() {
    20.         System.out.println("*************************************");
    21.         System.out.println("hello " + name + " 欢迎进入图书系统");
    22.         System.out.println("  1、查找图书 ");
    23.         System.out.println("  2、新增图书");
    24.         System.out.println("  3、删除图书 ");
    25.         System.out.println("  4、显示图书 ");
    26.         System.out.println("  0、退出系统");
    27.         System.out.println("*************************************");
    28.  
    29.  
    30.         Scanner scanner = new Scanner(System.in);
    31.         int choice = scanner.nextInt();
    32.         return choice;
    33.     }
    34. }

    子类——普通用户 NormalUser

    1. package com.user;
    2.  
    3. import com.operations.*;
    4.  
    5. import java.util.Scanner;
    6.  
    7.  
    8. public class NormalUser extends User {
    9.  
    10.     public NormalUser(String name) {
    11.         super(name);
    12.         this.iOperations=new IOperation[]{
    13.                 new ExitOperation(),
    14.                 new FindOperation(),
    15.                 new BorrowOperation(),
    16.                 new ReturnOperation()
    17.         };
    18.     }
    19.     public int menu() {
    20.         System.out.println("*************************************");
    21.         System.out.println("hello  "+name+"  欢迎进入图书系统");
    22.         System.out.println("  1、查找图书");
    23.         System.out.println("  2、借阅图书");
    24.         System.out.println("  3、归还图书");
    25.         System.out.println("  0、退出系统");
    26.         System.out.println("*************************************");
    27.         Scanner scanner = new Scanner(System.in);
    28.         int choice = scanner.nextInt();
    29.         return choice;
    30.     }
    31. }

    operations:

    接口IOperation

    1. package com.operations;
    2.  
    3. import com.book.BookList;
    4.  
    5.  
    6. public interface IOperation {
    7.     void work(BookList bookList);
    8. }

    AddOperation

    1. package com.operations;
    2.  
    3. import com.book.Book;
    4. import com.book.BookList;
    5.  
    6. import java.util.Scanner;
    7.  
    8.  
    9. //添加图书
    10. public class AddOperation implements IOperation{
    11.     public void work(BookList bookList) {
    12.         System.out.println("请输入要新增的书名：");
    13.         Scanner scanner=new Scanner(System.in);
    14.         String name=scanner.nextLine();
    15.         System.out.println("请输入图书作者：");
    16.         String author=scanner.nextLine();
    17.         System.out.println("图书价格：");
    18.         int price=scanner.nextInt();
    19.         scanner.nextLine();//吸收换行符
    20.         System.out.println("图书类型：");
    21.         String type=scanner.nextLine();
    22.  
    23.  
    24.         Book book=new Book(name,author,price,type);
    25.        //获取当前可以存放书的位置
    26.         int currentSize= bookList.getUsedSize();
    27.         //将书放入指定位置
    28.         bookList.setBooks(book,currentSize);
    29.         //属的有效个数加一
    30.         bookList.setUsedSize(currentSize+1);
    31.  
    32.     }
    33. }

    BorrowOperation

    1. package com.operations;
    2.  
    3. import com.book.Book;
    4. import com.book.BookList;
    5.  
    6. import java.util.Scanner;
    7.  
    8.  
    9. //借阅图书
    10. public class BorrowOperation implements IOperation{
    11.     @Override
    12.     public void work(BookList bookList) {
    13.         System.out.println("请输出要借阅图书的名字");
    14.         Scanner scanner=new Scanner(System.in);
    15.         String name=scanner.nextLine();
    16.         int currentSize = bookList.getUsedSize();
    17.         for (int i = 0; i < currentSize; i++) {
    18.             Book book=bookList.getPos(i);
    19.             if(name.equals(book.getName())) {
    20.                 if(book.isBorrowed()) {
    21.                     System.out.println("已被借出！");
    22.                 } else {
    23.                     book.setBorrowed(true);
    24.                     System.out.println("借阅成功");
    25.                 }
    26.                 return ;
    27.             }
    28.         }
    29.         System.out.println("查无此书");
    30.     }
    31. }

    DelOperation

    1. package com.operations;
    2.  
    3. import com.book.Book;
    4. import com.book.BookList;
    5. import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;
    6.  
    7. import java.util.Scanner;
    8.  
    9.  
    10. //删除图书
    11. public class DelOperation implements IOperation {
    12.     @Override
    13.     public void work(BookList bookList) {
    14.         System.out.println("请输入你要删除的书名：");
    15.         Scanner scanner=new Scanner(System.in);
    16.         String name=scanner.nextLine();
    17.         //遍历数组，查找是否有要删除的书，如果有，则记录下标
    18.         int index=-1;
    19.         int currentSize = bookList.getUsedSize();
    20.         for (int i = 0; i < currentSize; i++) {
    21.             Book book=bookList.getPos(i);
    22.             if(name.equals(book.getName())) {
    23.                 index=i;
    24.                 break;
    25.             }
    26.         }
    27.         //
    28.         if(index==-1) {
    29.             System.out.println("查无此书");
    30.             return ;
    31.         }
    32.         //删除
    33.         for (int i = index; i < currentSize-1; i++) {
    34.             //后面使用的是i+1，所以这里是Size-1
    35.             Book book=bookList.getPos(i+1);
    36.             bookList.setBooks(book,i);
    37.         }
    38.         //删除后,最后一个需要置空，否则一直有人引用，内存不会释放
    39.         bookList.setBooks(null,currentSize-1);
    40.         bookList.setUsedSize(currentSize-1);
    41.         System.out.println("删除成功！");
    42.     }
    43. }

    ExitOperation

    1. package com.operations;
    2.  
    3. import com.book.BookList;
    4.  
    5.  
    6. //退出
    7. public class ExitOperation implements IOperation{
    8.     @Override
    9.     public void work(BookList bookList) {
    10.         System.exit(0);
    11.     }
    12. }
    13.

    FindOperation

    1. package com.operations;
    2.  
    3. import com.book.Book;
    4. import com.book.BookList;
    5.  
    6. import java.util.Scanner;
    7.  
    8.  
    9. //查找图书
    10. public class FindOperation implements IOperation{
    11.     public void work(BookList bookList) {
    12.         System.out.println("请输入要查找图书的名字：");
    13.         Scanner scanner=new Scanner(System.in);
    14.         String name=scanner.nextLine();
    15.         int currentSize= bookList.getUsedSize();
    16.         for (int i = 0; i < currentSize; i++) {
    17.             Book book=bookList.getPos(i);
    18.             if(name.equals(book.getName())) {
    19.                 System.out.println(book);
    20.                 return;
    21.             }
    22.         }
    23.         System.out.println("没有这本书");
    24.     }
    25. }

     ReturnOperation 

    1. package com.operations;
    2.  
    3. import com.book.Book;
    4. import com.book.BookList;
    5.  
    6. import java.util.Scanner;
    7.  
    8.  
    9. public class ReturnOperation implements IOperation{
    10.     @Override
    11.     public void work(BookList bookList) {
    12.  
    13.         System.out.println("归还图书！");
    14.         System.out.println("请输入你要归还的图书的名字：");
    15.         Scanner scanner = new Scanner(System.in);
    16.         String name = scanner.nextLine();
    17.  
    18.  
    19.         int currentSize = bookList.getUsedSize();;
    20.         for (int i = 0; i < currentSize; i++) {
    21.             Book book = bookList.getPos(i);
    22.             if(name.equals(book.getName())) {
    23.                 book.setBorrowed(false);
    24.                 System.out.println("归还图书成功！");
    25.                 return;
    26.             }
    27.         }
    28.         System.out.println("没有你要归还的图书！");
    29.     }
    30. }

     ShowOperation

    1. package com.operations;
    2.  
    3. import com.book.Book;
    4. import com.book.BookList;
    5.  
    6.  
    7. //显示图书
    8. public class ShowOperation implements IOperation{
    9.     @Override
    10.     public void work(BookList bookList) {
    11.         int currentSize= bookList.getUsedSize();
    12.         for(int i=0;i
    13.             Book book=bookList.getPos(i);
    14.             System.out.println(book);
    15.         }
    16.     }
    17. }

    Main

    1. package com;
    2.  
    3. import com.book.BookList;
    4. import com.user.AdminUser;
    5. import com.user.NormalUser;
    6. import com.user.User;
    7.  
    8. import java.util.Scanner;
    9.  
    10. /**
    11.  * Created with IntelliJ IDEA.
    12.  * Description:
    13.  * User:龙宝
    14.  * Date:2022-08-10
    15.  * Time:15:20
    16.  */
    17. public class Main {
    18.     public static void main(String[] args) {
    19.         //准备数据
    20.         BookList bookList=new BookList();
    21.         //登录
    22.         User user=login();//user引用的对象与你的选择有关
    23.         while(true) {
    24.             int choice=user.menu();//根据引用的对象不同，调用相应的菜单，多态绑定
    25.             user.doOperation(choice,bookList);
    26.         }
    27.     }
    28.     public static User login() {
    29.         System.out.println("请输入姓名：");
    30.         Scanner scanner=new Scanner(System.in);
    31.         String userName=scanner.nextLine();
    32.         System.out.println("请输入身份：1、管理员    2、普通用户");
    33.         int choice= scanner.nextInt();
    34.         if(choice==1) {
    35.             return new AdminUser(userName);
    36.         } else {
    37.             return new NormalUser(userName);
    38.         }
    39.     }
    40. }

    运行结果的部分展示：

     

    本期结束啦，下期见！！！ 

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  • 原文地址：https://blog.csdn.net/LYJbao/article/details/126278202