作业提交，大家给提提意见，有什么简单点的方法实现吗

package com.imooc.exception;

import java.util.Arrays;
import java.util.Scanner;

public class BorrowBook {
    public static void main(String[] args) {
        BorrowBook borrowBook=new BorrowBook();
       borrowBook.Borrow();
    }

    public void Borrow(){
        // 书号分别对应的是1，2，3，4
        String[] books={"西游记","红楼梦","三国演义","水浒传"};
        System.out.println("欢迎使用图书管理系统！");
        System.out.println("1. 按照书名查找图书       2.按照序号查找图书");
        Scanner input =new Scanner(System.in);
        try {
           int num=input.nextInt();
           if (num==1){
               System.out.println("请输入书名：");
               Scanner input1=new Scanner(System.in);
               String bookname=input1.nextLine();
               boolean book= Arrays.asList(books).contains(bookname);
               if (book==true){
                   System.out.println(bookname+"借书成功！");
               }else {
                   throw new NoBookException("此书不存在");
               }
           }
           if (num==2){
               System.out.println("请输入书号：");
               Scanner input2=new Scanner(System.in);
               int shuhao=input2.nextInt();

                   if (shuhao>0 && shuhao<=books.length ){
                       System.out.println(books[shuhao-1]+"借书成功！");
                   }else{
                       throw new NoBookException("查无此书！");
                   }
           }
        }catch (NoBookException e){
            System.out.println(e);
            System.out.println();
            Borrow();
        }
    }
}

java菜鸟工程师

2019-05-07

源自：Java入门第三季 1-9

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4 回答

大神godbig
2019-07-28

你的shuhao应该>=0，就比如36行，应该这么写：if (shuhao>=0 && shuhao<books.length )。因为数组下标从0开始

0 回复有任何疑惑可以回复我~

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qq_慕沐4213791
2019-07-23

这个序号是自动就给定好了的吗？

0 回复有任何疑惑可以回复我~

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拆鸡

他拿的是索引吗？？？？

2019-07-31 回复有任何疑惑可以回复我~

杨小羊冲丫
2019-07-21

package com.imooc.exception; import java.util.Arrays;import java.util.Scanner; public class BorrowBook { public static void main(String[] args) { BorrowBook borrowBook=new BorrowBook(); borrowBook.Borrow(); } public void Borrow(){ // 书号分别对应的是1，2，3，4 String[] books={"西游记","红楼梦","三国演义","水浒传"}; System.out.println("欢迎使用图书管理系统！"); System.out.println("1. 按照书名查找图书 2.按照序号查找图书"); Scanner input =new Scanner(System.in); try { int num=input.nextInt(); if (num==1){ System.out.println("请输入书名："); Scanner input1=new Scanner(System.in); String bookname=input1.nextLine(); boolean book= Arrays.asList(books).contains(bookname); if (book==true){ System.out.println(bookname+"借书成功！"); }else { throw new NoBookException("此书不存在"); } } if (num==2){ System.out.println("请输入书号："); Scanner input2=new Scanner(System.in); int shuhao=input2.nextInt(); if (shuhao>0 && shuhao<=books.length ){ System.out.println(books[shuhao-1]+"借书成功！"); }else{ throw new NoBookException("查无此书！"); } } }catch (NoBookException e){ System.out.println(e); System.out.println(); Borrow(); } }}