java使用Arraylist集合完成圖書館添加并查找書本功能

輸入書本名稱,價格,對書本自動編号,可根據書本名稱,編号,價格查找相應書本

Book類

public class Book {
    private int id;
    private static int sid=1;
    private String name;
    private double price;

    public Book(String name, double price) {
        this.id = sid;
        sid++;
        this.name = name;
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

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

    @Override
    public String toString() {
        return "Book{" +
                "編号=" + id +
                ", 書名='" + name + '\'' +
                ", 價格=" + price +
                '}';
    }
}
           

public class Tools {
    Scanner input=new Scanner(System.in);
    ArrayList<Book> books=new ArrayList<>();
    public void add(){
        System.out.print("請輸入書本名稱,");
       // String name=input.next();
        System.out.println("書本價格:");
       // int price=input.nextInt();
        Book book=new Book(input.next(),input.nextInt());
        books.add(book);
        System.out.println("添加成功");
    }
    public void showAll(){
        Iterator<Book> it = books.iterator();
        while (it.hasNext()){
            System.out.println(it.next());
        }
    }
    public void selectBookForId(int seleid){
        Iterator<Book> it = books.iterator();
        Book book1;
        while (it.hasNext()){
            book1=it.next();
            if (book1.getId()==seleid-1){
                System.out.println(it.next());
            }
        }
    }
    public void selectBookForName(String selename){
        Book book;
        for (int i = 0; i <books.size(); i++) {
            book=books.get(i);
            if (selename.equals(book.getName()))
            {
                System.out.println(book.toString());
            }
        }
    }
    public void selectBookForPrice(double seleprice){
        Book book;
        for (int i = 0; i <books.size(); i++) {
            book=books.get(i);
            if (seleprice==book.getPrice()){
                System.out.println(book.toString());
            }
        }
    }
}
           

public class LibraryTest {
    static Scanner input = new Scanner(System.in);
    static Tools tools = new Tools();
    public static void main(String[] args) {
        System.out.println("---歡迎使用本圖書系統---");
        while (true) {
            System.out.println("添加書請按1,查找書請按2,退出請按0");
            int in = input.nextInt();
            if (in == 1) {
                addBook();
            } else if (in == 2) {
               selectBook();
            } else if (in == 0) {
                break;
            } else {
                System.out.println("暫時未開放此功能...");
            }
        }
        tools.showAll();//最後顯示是以書本
    }

    public static void addBook() {
        for (int i = 0; i < 3; i++) {
            System.out.println("一次輸三本");
            tools.add();
        }
    }
    public static void selectBook(){
        System.out.println("按編号查找請按1,書名請按2,價格請按3");
        tools.showAll();
        int select = input.nextInt();
        if (select == 1) {
            System.out.println("請輸入圖書編号:");
            tools.selectBookForId(input.nextInt());
        } else if (select == 2) {
            System.out.println("請輸入圖書名稱:");
            String string = input.next();
            tools.selectBookForName(string);
        } else if (select == 3) {
            System.out.println("請輸入價格");
            tools.selectBookForPrice(input.nextDouble());
        } else {
            System.out.println("暫時未開放此功能...");
        }
    }
}