Java异常之图书管理系统

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。