本文实例为大家分享了Java异常之图书管理系统的具体代码，供大家参考，具体内容如下

模拟借书系统，任务要求：

感觉自己的写出来的代码不够简洁，参考了其他的案例写了一个，效果如下：

结构：

运行异常1：

运行异常2：

运行异常3：

正常运行：

1、名称查询

2、序号查询：

Book.java:

package com.tony;/* * 图书租赁系统 */public class Book { public String bookName; public int bookId; public Book(String bookName, int bookId){ this.bookName = bookName; this.bookId = bookId; } }

自定义异常类MyException.java:

package com.tony;/* * 自定义异常类 */public class MyException extends Exception{ //有参构造方法 public MyException(String message) { super(message); };}

BorrowBook.java:

package com.tony;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.Scanner;/* * 主程序 */public class BorrowBook { Book book [] = {new Book("高等数学", 1), new Book("大学英语", 2), new Book("Android", 3), new Book("会计基础", 4)}; public List<Book> listBooks; //无参构造方法 public BorrowBook() { this.listBooks = new ArrayList<Book>(); } public void addBook(){ listBooks.addAll(Arrays.asList(book)); } public void systemOut() { System.out.println("*******欢迎使用借书系统*******"); System.out.println("*-*-*-*图书一览表：*-*-*-*"); System.out.println(" 书名" + "\t\t" + "序号"); for(Book book:listBooks) { System.out.println(book.bookName + "\t\t " +book.bookId); } } private Scanner scanner = new Scanner(System.in); public static void main(String[] args) { BorrowBook borrowBook = new BorrowBook(); borrowBook.addBook(); borrowBook.systemOut(); while(true) { 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"); switch (borrowBook.scanf()) { case 1://根据用户不同的输入内容执行 try { System.out.println("书籍：" + borrowBook.findByName()); break; } catch (Exception e) { System.out.println(e.getMessage()); continue; } case 2: try { System.out.println("书籍：" + borrowBook.findById()); break; } catch (Exception e) { System.out.println(e.getMessage()); continue; } default: System.out.println("命令错误，请重试."); continue; } break; } borrowBook.scanner.close(); } public String findByName() throws MyException{ System.out.println("*****请输入书籍的名称-->"); String name = scanner.next(); for (Book books : book) { if (name.equals(books.bookName)) { return books.bookName + "\t序号：" +books.bookId; } } throw new MyException("名称错误，请重试."); } public String findById() throws MyException { System.out.println("*****请输入书籍的序号-->"); int in = scanner.nextInt(); for (int i = 0; i < book.length; i++) { if (in == (i + 1)) { return book[i].bookName + "\t序号：" + (i+1); } } throw new MyException("下标越界，请重试."); } public int scanf() { try { int in = scanner.nextInt(); return in; } catch(Exception e) { scanner = new Scanner(System.in); return -1; } }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。