package com.kandy.class8;

public class Book {
    private String name;
    private int id;

    public String getName() {
        return name;
    }

    public Book(int id,String name) {
        this.name = name;
        this.id = id;
    }

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

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
}

package com.kandy.class8;

public class BookNotFindExeption extends Exception{
    public BookNotFindExeption(){}
    public BookNotFindExeption(String message) {
        super(message);
    }
}

package com.kandy.class8;
import java.util.Scanner;

public class InitialBook {
    //创建图书
    Book[] books = {
            new Book(1, "语文"),
            new Book(2, "数学"),
            new Book(3, "英语"),
    };
    //输入
    Scanner input;

    //显示图书菜单,进入查找分类
    public void showMenu() {
        try {
            System.out.println("借书请按编号或书名（1：按编号/2：按书名）");
            System.out.println("编号\t\t 书名");
            for (Book book : books) {
                System.out.println(" " + book.getId() + "\t\t《" + book.getName() + "》");
            }
            System.out.print("请输入1或2，0退出：");
            input = new Scanner(System.in);

            int num = input.nextInt();
            switch (num) {
                case 0:
                    System.exit(0);
                    break;
                case 1:
                    findForId();
                    break;
                case 2:
                    findForName();
                    break;
                default:
                    showMenu();
            }
        } catch (Exception e) {
            System.out.println("输入有误，请根据提示输入。");
            showMenu();
        } finally {
            input.close();
        }
    }

    //按编号查找
    public void findForId() {
        try {
            System.out.print("请输入图书的编号，输入0返回上一级：");
            input = new Scanner(System.in);
            int num = input.nextInt();
            if (num == 0) showMenu();

            boolean isFind = false;
            for (Book book : books) {
                if (book.getId() == num) {
                    isFind = true;
                    System.out.println("********找到图书:(编号：" + book.getId() + "书名：" + book.getName() + ")");
                    showMenu();
                    break;
                }
            }
            if (!isFind) {
                throw new BookNotFindExeption("未找到此编号的图书！");
            }
        } catch (BookNotFindExeption e) {
            System.out.println(e.getMessage());
            findForId();
        } catch (Exception e) {
            System.out.println("输入有误，请根据提示输入。");
            findForId();
        } finally {
            input.close();
        }
    }

    //按书名查找
    public void findForName() {
        try {
            System.out.print("请输入图书的名称，输入0返回上一级：");
            input = new Scanner(System.in);
            String name = input.nextLine();
            if (name.equals("0")) showMenu();

            boolean isFind = false;
            for (Book book : books) {
                if (book.getName().equals(name)) {
                    isFind = true;
                    System.out.println("*********找到图书:(编号：" + book.getId() + "书名：" + book.getName() + ")");
                    showMenu();
                    break;
                }
            }
            if (!isFind) {
                throw new BookNotFindExeption("未找到此名称的图书！");
            }
        } catch (BookNotFindExeption e) {
            System.out.println(e.getMessage());
            findForName();
        } catch (Exception e) {
            System.out.println("输入有误，请根据提示输入。");
            findForName();
        } finally {
            input.close();
        }
    }

    //程序入口
    public static void main(String[] args) {
        InitialBook in = new InitialBook();
        //显示图书列表
        in.showMenu();
    }
}