图书管理系统

一:类和接口:

1:Book类

定义了一些常用的属性和方法

public class Book {
    private String name;
    private String author;
    private int price;
    private String type;
    private boolean isBorrowed;

    public Book(String name, String author, int price, String type) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
    }

    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 int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public boolean isBorrowed() {
        return isBorrowed;
    }

    public void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }

    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                ", isBorrowed=" +
                ( (isBorrowed == true) ? "，已借出" : "，未借出" )+
              //三目运算符,当书被借出时,显示已借出,否则显示未借出
                '}';

    }
}

2:书架类(BookList类)

用于放一些书,以及获取书的信息,设置书,设置书的个数,获取书的个数

public class BookList {
    private Book[] books=new Book[10];
    private int useSize ;

    public BookList() {
        books[0]=new Book("西游记","吴承恩",12,"小说");
        books[1]=new Book("三国演义","罗贯中",15,"小说");
        books[2]=new Book("红楼梦","曹雪芹",10,"小说");
        this.useSize=3;
    }
    public int getUseSize() {
        return useSize;
    }

    public void setUseSize(int useSize) {
        this.useSize = useSize;
    }
    public Book getBook(int pos){
        return books[pos];
    }
    public void setBook(int pos,Book book){
        books[pos]=book;
    }
}

3:User类

用户类,定义了用户的姓名属性,和对图书进行操作数组的属性,

public abstract class User {
    private String name;
    public Operation[] operations;

    public User(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public abstract int  menu();
    public  void doOperation(int choice , BookList bookList){
        Operation operation1=this.operations[choice];
        operation1.work(bookList);//根据传入的choice进行函数调用
    }


}

4:管理员类(AdminUser )

public class AdminUser extends User{

    public AdminUser(String name) {
        super(name);
        this.operations=new Operation[]{
              new ExitOperation(),
              new ShowOperation(),
              new AddOperation(),
              new DelOperation(),
              new FindOperation()
      };
    }
    @Override
    public int  menu() {
        System.out.println("*****管理员界面*****");
        System.out.println("*****0.退出系统****");
        System.out.println("*****1.显示图书****");
        System.out.println("*****2.新增图书****");
        System.out.println("*****3.删除图书****");
        System.out.println("*****4.查找图书****");
        System.out.println("请输入你的操作: ");
        Scanner scanner=new Scanner(System.in);
        int choice = scanner.nextInt();//输入数字,根据数字调用相应的方法
        return choice;
    }

}

5:普通用户类(NormalUser)

public class NormalUser extends User{
    public NormalUser(String name) {
        super(name);
       operations=new Operation[]{
               new ExitOperation(),
               new BorrowOperation(),
               new FindOperation(),
               new ReturnOperation(),
               new ShowOperation()
       };
    }

    public int menu() {
        System.out.println("*****普通用户界面*****");
        System.out.println("*****0.退出系统****");
        System.out.println("*****1.借阅图书****");
        System.out.println("*****2.查找图书****");
        System.out.println("*****3.归还图书****");
        System.out.println("*****4.显示图书****");
        System.out.println("请输入你的操作: ");
        Scanner scanner=new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

6:测试类

public class Test {
    public static User login(){
        System.out.println("请输入你的姓名:");
        Scanner scanner=new Scanner(System.in);
        String name=scanner.nextLine();
        System.out.println("请选择你的身份: 0:普通用户,1:管理员");
        int choice =scanner.nextInt();
        if(choice==1){
       return new AdminUser(name);
        }
        return new NormalUser(name);
    }
    public static void main(String[] args) {
        BookList bookList=new BookList();
        User user=login();
        while(true) {
            int choice = user.menu();
            user.doOperation(choice, bookList);
        }
    }
}

一:管理员:

1:管理员登录界面

代码实现:

  public int  menu() {
        System.out.println("*****管理员界面*****");
        System.out.println("*****0.退出系统****");
        System.out.println("*****1.显示图书****");
        System.out.println("*****2.新增图书****");
        System.out.println("*****3.删除图书****");
        System.out.println("*****4.查找图书****");
        System.out.println("请输入你的操作: ");
        Scanner scanner=new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }

2:显示图书功能:

思路:
我们要将所有的图书信息显示出来,那么我们将遍历书架上所有的书即可.
代码实现:

  public void work(BookList bookList) {
        System.out.println("*****显示图书*****");
        int size=bookList.getUseSize();//获得书的个数
        for (int i = 0; i < size; i++) {//遍历书
             Book book=bookList.getBook(i);//获得该书的信息
            System.out.println(book.toString());//打印信息
        }

3:新增图书功能

思路:
在这里手动添加书名,书的作者,类型,价格后,创建一个书的对象,
然后采取尾插法:将新增加的图书信息添加到最后,然后让计数器+1.

public class AddOperation implements Operation{
    @Override
    public void work(BookList bookList) {
        System.out.println("*****新增图书*****");
        System.out.println("请输入新增的书名:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        System.out.println("请输入作者:");
        String author=scanner.nextLine();
        System.out.println("请输入类型");
        String type=scanner.nextLine();
        System.out.println("请输入价格");
        int price=scanner.nextInt();
         Book book=new Book(name,author,price,type);
         int size=bookList.getUseSize();
         bookList.setBook(size,book);
         bookList.setUseSize(size+1);
         System.out.println("新增成功,以下是该书的信息");
         System.out.println(book);


    }
}

4:删除图书功能

思路:
根据书名寻找要删除的图书信息:
通过遍历书的信息,找到要删除的图书,然后让该图书后面的图书依次成为前面图书,最后再让图书个数-1;
代码实现:

   public void work(BookList book) {
        System.out.println("请输入要删除的书名");
        Scanner scanner=new Scanner(System.in);
        String name=scanner.nextLine();
        int  size=book.getUseSize();
        int i=0;
        int pos=0;
        for (; i < size; i++) {
            if(book.getBook(i).getName().equals(name)){
                pos=i;
                break;
            }
        }
        if(i==size){
            System.out.println("要删除的书不存在");
        }else{
            for (int j = pos; j <size-1 ; j++) {
                book.setBook(j,book.getBook(j+1));
            }
            book.setUseSize(size-1);
            System.out.println("删除成功");
        }
    }

5:查找图书功能

思路:
根据书名查找图书,并打印该图书的信息
通过遍历图书,找到要查找的图书,找到了便打印信息,并返回
代码实现:

   public void work(BookList bookList) {
        System.out.println("请输入要查找的书名:");
        Scanner scanner=new Scanner(System.in);
        String name=scanner.nextLine();
        int size=bookList.getUseSize();
        for (int i = 0; i <size ; i++) {
            Book book=bookList.getBook(i);
            if(book.getName().equals(name)){
                System.out.println("找到了,该书信息如下:");
                System.out.println(book);
                return;
            }
        }
        System.out.println("未查到此书");
    }

二 :用户:

1:用户登录界面

代码实现:

        public int menu() {
        System.out.println("*****普通用户界面*****");
        System.out.println("*****0.退出系统****");
        System.out.println("*****1.借阅图书****");
        System.out.println("*****2.查找图书****");
        System.out.println("*****3.归还图书****");
        System.out.println("*****4.显示图书****");
        System.out.println("请输入你的操作: ");
        Scanner scanner=new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }

2:借阅图书

思路:
根据书名借阅图书:
通过遍历图书,找到要借阅的图书,并将其的是否借出属性改为true即可,然后返回.
代码实现:

    public void work(BookList bookList) {
        System.out.println("请输入要借阅的书名:");
        Scanner scanner=new Scanner(System.in);
        String name=scanner.nextLine();
        int size=bookList.getUseSize();
        for (int i = 0; i < size; i++) {
             Book book=bookList.getBook(i);
             if(book.getName().equals(name)){
             book.setBorrowed(true);
                 System.out.println("借阅成功");
             return;
             }
        }
        System.out.println("该书不存在");
    }
}

3:查找图书:

思路:
根据书名查找书的信息:
通过遍历书的信息,找到书的信息(未找到,直接打印"未查到此书"并返回即可),然后打印书的信息即可.

代码实现

public void work(BookList bookList) {
        System.out.println("请输入要查找的书名:");
        Scanner scanner=new Scanner(System.in);
        String name=scanner.nextLine();
        int size=bookList.getUseSize();
        for (int i = 0; i <size ; i++) {
            Book book=bookList.getBook(i);
            if(book.getName().equals(name)){
                System.out.println("找到了,该书信息如下:");
                System.out.println(book);
                return;
            }
        }
        System.out.println("未查到此书");
    }