package BookSystem;public class Books{ public int bid; public String bname; public Books() { } public Books(int id,String name) { bid=id; bname=name; }}```　　package BookSystem;
import java.util.Scanner;
　　public class Test
{
static Books [] book={new Books(0,"计算机应用数学"),
new Books(1,"大学英语"),
new Books(2,"程序设计")};
private static Scanner input;
public static void main(String[] args) { input = new Scanner(System.in); Test test1=new Test(); //用来调用对象 Books tempbook=new Books(); //用来保存从方法中返回的图书信息 System.out.println("欢迎使用图书管理系统"); while(true) { System.out.println("请选择图书查询方式（0-退出）：1-按照书名查找图书；2-按照序号查找图书"); try { int sel=input.nextInt(); if(0==sel) { System.out.println("谢谢您的使用，再见！"); return ; } switch(sel) { case 1: System.out.print("请输入书名："); tempbook=test1.bookname(book); System.out.println("已找到book:序号 "+tempbook.bid+" 书名 "+tempbook.bname); break; case 2: System.out.print("请输入序号："); tempbook=test1.booknum(book); System.out.println("已找到book:序号 "+tempbook.bid+" 书名 "+tempbook.bname); break; default:System.out.println("输入错误"); } }catch(Exception e) { System.out.println(e.getMessage()); } }}public Books bookname (Books[]book) throws Exception { String name=input.next(); for (int i=0;i<book.length;i++) { if(name.equals(book[i].bname)) { return book[i]; } } throw new Exception("您输入的书籍不存在！");}public Books booknum(Books[]book) throws Exception { input = new Scanner(System.in); int id=input.nextInt(); if (id>=0&&id<book.length) { return book[id]; } throw new Exception ("输入的序号无匹配值"); }　　}