JAVA入门第三季模拟借书系统

import java.util.Scanner;
import java.util.ArrayList;

public class BooksLable {

    static ArrayList<String> books = new ArrayList<String>();
    static ArrayList<String> books2 = new ArrayList<String>();

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        boolean isOk = true;

        booksStore();
        while (isOk) {
            System.out.println("输入命令:1-按照名称查找图书；2-按照序号查找图书");
            int choice = choose();
            if (choice == 1) {

                bookSelect();

            } else if (choice == 2) {
                numSelect();
            }

        }
    }

    // 进行图书的序号以及书名存档
    public static void booksStore() {
        // TODO Auto-generated method stub
        books.add("\t1\t高等数学");
        books.add("\t2\t数据库");
        books.add("\t3\tC语言");
        books.add("\t4\tJAVA");
        books.add("\t5\t机械原理");
        books.add("\t6\t机械设计");
        books.add("\t7\t机械制图");

        for (int i = 0; i < books.size(); i++) {
            books2.add(books.get(i).split("\t")[2]);
        }

    }

    // 根据序列号查找图书
    private static void numSelect() {
        // TODO Auto-generated method stub
        int num = 0;
        boolean isError = true;
        do {
            try {
                System.out.println("输入图书序号：");
                Scanner input = new Scanner(System.in);
                num = input.nextInt();
                isError = false;
            } catch (Exception e) {
                // e.printStackTrace();
                // System.out.println(e.getMessage());
                System.out.println("命令行输入错误！请根据提示输入数字命令！");
            }

        } while (isError);

        if (books.size() < num) {
            System.out.println("图书不存在！");
        } else {
            System.out.println("book:" + books2.get(num));

        }

    }

    // 根据书名查找图书
    private static void bookSelect() {
        // TODO Auto-generated method stub
        boolean isSelect = false;
        String lable = null;
        System.out.println("请输入图书名称：");
        Scanner input = new Scanner(System.in);
        lable = input.nextLine();
        for (int i = 0; i < books2.size(); i++) {
            if (lable.equals(books2.get(i))) {
                System.out.println("book:" + lable);
                isSelect = true;
                break;
            }
        }
        if (isSelect == false) {
            System.out.println("图书不存在！");
        }

    }

    // 选择命令
    private static int choose() {
        // TODO Auto-generated method stub
        int num = 0;
        int lable = 0;// 用来标记输入错误是由于输入不匹配，还是由于输入数字既不是1也不是2
        boolean isError = true;
        do {
            try {
                Scanner input = new Scanner(System.in);
                num = input.nextInt();
            } catch (Exception e) {
                // e.printStackTrace();
                // System.out.println(e.getMessage());
                System.out.println("命令行输入错误！请根据提示输入数字命令！");
                lable = 0;
            }
            if (num != 1 && num != 2 && lable != 0) {
                System.out.println("命令行输入错误！请根据提示输入数字命令！");
            } else {
                isError = false;
            }

        } while (isError);

        return num;
    }

}