【Java】图书管理系统

目录

Book类

BookList类

AddOperation类

BorrowOperation类

DelOperation类

DisplayOperation类

ExitOperation类

FindOperation类

IOPeration接口

ReturnOperation类

AdminUser类

NormalUser类

User类

Java实现一个完整的对象：首先我们要找对象

其次是创建对象和使用对象

在图书管理系统中，首先要想到的对象：Book 、Book LIst 、User等等

还有各个operation类，我将把他们放进同一个包里

Book类

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;//是否被借出

    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 isBorrowed() {
        return isBorrowed;
    }

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

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

    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                ((isBorrowed==true)?"已借出":"未借出")+
                //", isBorrowed="+isBorrowed+
                '}';
    }
}

BookList类

public class BookList {
    private Book[] books=new Book[10];
    private int usedSize;
    public BookList(){
        books[0]=new Book("三国演义","罗贯中",90,"小说");
        books[1]=new Book("西游记","吴承恩",70,"小说");
        books[2]=new Book("红楼梦","曹雪芹",89,"小说");
        this.usedSize=3;
    }
    //获取当前数组元素的个数
    public int getUsedSize(){
        return usedSize;
    }
    //修改当前数组中元素的个数
    public void setUsedSize(int useSize){
        this.usedSize=usedSize;
    }
    //获取下表为pos的书
    public Book getPos(int pos){
        return books[pos];
    }
    //给数组的pos位置放一本书
    public void setBooks(int pos,Book book){
        books[pos]=book;
    }
}

AddOperation类

public class AddOperation implements IOPeration {
    @Override
    public void work(BookList bookList) {
        System.out.println("新增图书！");
        System.out.println("请输入图书的名字:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        System.out.println("请输入图书的作者:");
        String author = scanner.nextLine();
        System.out.println("请输入图书的类型:");
        String type = scanner.nextLine();
        System.out.println("请输入图书的价格:");
        int price = scanner.nextInt();

        Book book = new Book(name,author,price,type);

        int currentSize = bookList.getUsedSize();
        bookList.setBooks(currentSize,book);

        bookList.setUsedSize(currentSize+1);

        System.out.println("新增成功！");

    }

}

BorrowOperation类

public class BorrowOperation implements IOPeration {
    @Override
    public void work(BookList bookList){
        System.out.println("借阅图书！");
        System.out.println("请输入你借阅图书的名字");
        Scanner scan=new Scanner(System.in);
        String name=scan.nextLine();
        int currentSize=bookList.getUsedSize();
        int i = 0;
        for (; i < currentSize; i++) {
            Book book=bookList.getPos(i);
            if(book.getName().equals(name)){
            book.setBorrowed(true);
                System.out.println("借阅成功！！");
                return;
            }
        }
        System.out.println("没有你要借的书!");
    }
}

DelOperation类

public class DelOperation implements IOPeration{
    @Override
    public void work(BookList bookList){
        System.out.println("删除图书！");
        System.out.println("请输入图书的名字");
        Scanner scan=new Scanner(System.in);
        String name=scan.nextLine();
        int i = 0;int index=0;
        int currentSize=bookList.getUsedSize();
        for (; i < currentSize; i++) {
            Book book=bookList.getPos(i);
            if(book.getName().equals(name)){
                index=i;
                break;
            }
        }
        if(i==currentSize){
            System.out.println("没有你要删除的图书");
            return;
        }
        for (int j = index; j < currentSize; j++) {
            Book book=bookList.getPos(j+1);
            bookList.setBooks(j,book);
        }
        bookList.setBooks(currentSize-1,null);
        bookList.setUsedSize(currentSize-1);
        System.out.println("删除结束");
    }
}

DisplayOperation类

public class DisplayOperation implements IOPeration{
    @Override
    public void work(BookList bookList){
        System.out.println("展示图书！");
        int currentSize=bookList.getUsedSize();
        for (int i = 0; i < currentSize; i++) {
        Book book=bookList.getPos(i);
            System.out.println(book);
        }
    }
}

ExitOperation类

public class ExitOperation implements IOPeration{
    public void work(BookList bookList){
        System.out.println("退出！");
        int currentSize=bookList.getUsedSize();
        for(int i=0;i<currentSize;i++){
            bookList.setBooks(i,null);
        }
        System.exit(0);
    }
}

FindOperation类

public class FindOperation implements IOPeration{
    @Override
    public void work(BookList bookList){
        System.out.println("查找图书！");
        System.out.println("请输入你要查找的书的名字");
        Scanner scan=new Scanner(System.in);
        String name=scan.nextLine();
        int currentSize=bookList.getUsedSize();
        for (int i = 0; i < currentSize; i++) {
            Book book=bookList.getPos(i);
            if(book.getName().equals(name)){
                System.out.println("找到这本书了，信息如下：");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有这本书");
    }
}

IOPeration接口

public interface IOPeration {
void work(BookList bookList);
}

ReturnOperation类

public class ReturnOperation implements IOPeration{
    @Override
    public void work(BookList bookList){
        System.out.println("归还图书！");
        System.out.println("请输入你归还图书的名字");
        Scanner scan=new Scanner(System.in);
        String name=scan.nextLine();
        int currentSize=bookList.getUsedSize();
        int i = 0;
        for (; i < currentSize; i++) {
            Book book=bookList.getPos(i);
            if(book.getName().equals(name)){
                book.setBorrowed(true);
                System.out.println("归还成功！！");
                return;
            }
        }
        System.out.println("没有你要归还的书!");
    }

}

AdminUser类

public class AdminUser extends User {
public AdminUser(String name){
    super(name);
    //对应相应的方法
    this.ioperations=new IOPeration[]{
            new ExitOperation(),
            new FindOperation(),
            new AddOperation(),
            new DelOperation(),
            new DisplayOperation(),
    };
}
    public int menu(){
        System.out.println("hello "+this.name);
        System.out.println("1.查找图书");
        System.out.println("2.新增图书");
        System.out.println("3.删除图书");
        System.out.println("4.显示系统");
        System.out.println("0.退出系统");
        Scanner scan=new Scanner(System.in);
        int choice=scan.nextInt();
        return choice;
    }
}

NormalUser类

public class NormalUser extends User {
public NormalUser(String name){
    super(name);
    this.ioperations=new IOPeration[]{
            new ExitOperation(),
            new FindOperation(),
            new BorrowOperation(),
            new ReturnOperation()
    };
}
public int menu(){
    System.out.println("hello "+this.name);
    System.out.println("1.查找图书");
    System.out.println("2.借阅图书");
    System.out.println("3.归还图书");
    System.out.println("0.退出系统");
    System.out.println("请输入您的操作：");
    Scanner scan=new Scanner(System.in);
    int choice=scan.nextInt();
    return choice;
}
}

User类

public abstract class User {
    protected String name;
    public IOPeration[] ioperations;
    public User(String name) {
        this.name = name;
    }
    public abstract int menu();
    public void doOperation(int choice, BookList bookList){
        ioperations[choice].work(bookList);
    }
}