慕哥1121172
2019-04-21 21:04
package com.jsdx;
import java.util.Scanner;
import java.util.Arrays;
public class RentBook
{
private static String[] bookName = {"悟空传","斗罗大陆","斗破苍穹","择天记","遮天"};
public RentBook()
{
}
public static void main(String[] args)
{
RentBook rentBook = new RentBook();
rentBook.select();
}
public void bookNumber()
{
System.out.println("输入图书序号:");
@SuppressWarnings("resource")
Scanner inNumber = new Scanner(System.in);
if(inNumber.hasNextInt())
{
int number = inNumber.nextInt();
if(number > 0 && number <= bookName.length)
{
System.out.println("图书信息:" + bookName[number-1]);
}
else
{
try
{
System.out.println("没有该序号图书!");
select();
} catch (Exception e)
{
e.printStackTrace();
}
}
}
else
{
try
{
System.out.println("输入错误,请输入数字!");
bookNumber();
} catch (Exception e)
{
e.printStackTrace();
}
}
}
public void inName()
{
System.out.println("输入图书名称:");
@SuppressWarnings("resource")
String name = new Scanner(System.in).nextLine();
boolean flag = Arrays.asList(bookName).contains(name);
if(flag)
{
System.out.println("图书信息:" + name);
}
else
try
{
System.out.println("没有该名称图书!");
select();
} catch (Exception e1)
{
e1.printStackTrace();
}
}
public void select()
{
System.out.println("输入命令:1-按书名查找图书; 2-按序号查找图书");
@SuppressWarnings("resource")
Scanner inCammond = new Scanner(System.in);
try
{
if(inCammond.hasNextInt())
{
int cammond = inCammond.nextInt();
if(cammond == 1)
{
inName();
}
else if (cammond == 2)
{
bookNumber();
}
else
{
throw new CammondException();
}
}
else
{
throw new CammondException();
}
}catch (CammondException e)
{
System.out.println("命令无效,请按提示输入命令!!!");
select();
}
}
}//CammondException时一般的自定义类型
我其实都不懂什么是异常
Java入门第三季
409776 学习 · 4546 问题
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