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;

}

}

}

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