JAVA图书管理练习

0.前言

1.在学习了面向对象,接口继承等语法后,综合使用这些语法完成一个简单的图书管理小练习.

2.在写代码之前,我们首先要把各种类抽象出来,图书管理会有多个类,比如书类,放书的书架类,操作书籍的类,用户类

1.书类(BOOK)

1.1 Book

先创建一个包,里面存放书类和书架类,
在这里插入图片描述
BOOK类包含五个成员变量并且添加构造方法等其他成员方法,当我们实例化对象后,一本书就会有这五个属性和成员方法.

public class Book {
    private String name; //书名
    private String author; //作者
    private int price; //价格
    private String type; //类型
    private Boolean isBorrowed=false; //是否借出

    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 getBorrowed() {
        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":"false")  +
                '}';
    }

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

}

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1.2 BookList

书架用来存放实例化后的书对象,里面包含了两个成员变量,一个是记录存放书籍数量的UsedSize,另外一个是创建的Book类数组,用来存放书对象.

   //BookList

    Book[] books=new Book[10];
    
    int UsedSize; //已借出书籍的数量
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public class BookList {
    private Book[] books=new Book[10];
    private int UsedSize; //已借出书籍的数量

    public  BookList(){
        this.books[0]=new Book("三国演义","罗贯中",119,"小说");
        this.books[1]=new Book("鸟哥的 Linux 私房菜","鸟哥",118,"小说");
        this.books[2]=new Book("剑指 Offer","何海涛",65,"小说");
        this.UsedSize=3;
    }
    //放书
    public void setBooks(int pos,Book book) {
        books[pos]=book;
    }

    public int getUsedSize() {
        return UsedSize;
    }

    public void setUsedSize(int UsedSize) {
        this.UsedSize = UsedSize;
    }

    public Book getbook(int pos){
        return books[pos];
    }
}
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2. User类

2.1 user类

在这里插入图片描述

我们把用户分为管理员和普通用户,分别对应不同的功能
在这里插入图片描述

User类

public  abstract class User {
    protected String name;
    public abstract int menu();

    protected Ioperation[] ioperations;

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

    public void dowork(int choice, BookList bookList){
        this.ioperations[choice].work(bookList);
    }

}
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2.2 AdminUser类

public class AdminUser extends User {
    public AdminUser(String name) {
        super(name);
        this.ioperations =new Ioperation[]{
                new ExitOperation(),
                new AddOperation(),
                new FindOperation(),
                new DisplayOperation(),
                new DelOperation()
        };
    }

    public int menu() {
        System.out.println("=============================");
        System.out.println("Hello " + name + ", 欢迎使用图书管理系统!");
        System.out.println("0. 退出系统");
        System.out.println("1. 增加图书");
        System.out.println("2. 查找图书");
        System.out.println("3. 展示图书");
        System.out.println("4. 删除图书");
        System.out.println("=============================");
        System.out.println("请输入要选择的选项:");
        Scanner sc = new Scanner(System.in);
        int choice = sc.nextInt();
        return choice;
    }
}
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2.3 NormalUser类

public class NormUser extends User{
    public int menu() {
        System.out.println("=============================");
        System.out.println("Hello " + name + ", 欢迎使用图书管理系统!");
        System.out.println("0. 退出系统");
        System.out.println("1. 展示图书");
        System.out.println("2. 查找图书");
        System.out.println("3. 借阅图书");
        System.out.println("4. 归还图书");
        System.out.println("=============================");
        System.out.println("请输入要选择的选项:");
        Scanner sc = new Scanner(System.in);
        int choice = sc.nextInt();
        return choice;
    }
    public NormUser(String name){
        super(name);
        this.ioperations=new Ioperation[]{
                new ExitOperation(),
                new DisplayOperation(),
                new FindOperation(),
                new BorrowOperation(),
                new ReturnOperation()
        };
    }
}
`
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3.Operation类