一个借书系统，主要是使用异常来对借书时的情况进行把控。

基本可以跑。写的还是有点乱。

不足的地方还是很多的，希望大家指教，代码如下：

package com.Library;

import java.util.*;

public class BookNewSystem {

final Book[] books={new Book(1,"数据结构"),new Book(2,"高数"),new Book(3,"C语言")};

static Scanner input = new Scanner(System.in);

public static void main(String[] args) throws Exception {

// TODO Auto-generated method stub

BookNewSystem BNS = new BookNewSystem();

while(true){

System.out.println("输入命令：1-按照书名查找图书；2-按照序号查找图书");

try{

int input_number = inputNumber();

switch(input_number){

case 1:

System.out.println("输入图书名称：");

String bookname = input.next();

String temp = BNS.FindBookByName(bookname);

// BNS.FindBookByName(bookname);

System.out.println("book："+bookname);

break;

case 2:

BNS.FindBookByOrder();

// System.out.println("输入图书序号：");

// int booknumber = inputNumber();

break;

default:

System.out.println("命令输入错误！请根据提示输入数字命令！");

continue;

}

break;

}

catch(Exception me){

System.out.println(me.getMessage());

continue;

}

}

}

int FindBookByOrder(){

int j=0;

while(true){

System.out.println("输入图书序号：");

int booknumber = inputNumber();

if(booknumber==-1){

System.out.println("命令输入错误！请根据提示输入数字命令！");

continue;

}

else{

if(booknumber>books.length){

System.out.println("图书不存在");

break;

}

else{

System.out.println("book:"+books[booknumber-1].BookName);

break;

}

}

}

return 0;

}

String FindBookByName(String name) throws Exception {

int i=0;

for(;i

if(name.equals(books[i].BookName))

return name;

}

throw new Exception("图书真的不存在！"+name);

}

static int inputNumber(){

int order;

Scanner inp = new Scanner(System.in);

try{

order = inp.nextInt();

return order;

}

catch(Exception e){

return -1;

}

}

}