package try_catch;

import java.util.InputMismatchException;

import java.util.Scanner;

public class TryCatchPractice {

public static void main(String[]args){

TryCatchPractice trycat=new TryCatchPractice();

trycat.InputClassException();

}

public void InputClassException(){

try{

Scanner in=new Scanner(System.in);

String[] books={"語(yǔ)文","數(shù)學(xué)","英語(yǔ)"};

System.out.println("歡迎光臨本圖書管理系統(tǒng)");

System.out.println("1.書名查詢。2.序號(hào)查詢");

int a=in.nextInt();

switch(a){

case 1: //查找圖書

System.out.println("請(qǐng)輸入您要查詢的圖書：");

String b=in.next();

try{

for(int i=0;i<books.length;i++){

if(books[i].equals(b)){//如果查詢的書名不為空，輸出書本信息

System.out.println("查詢成功");

}else{//如果查詢?yōu)榭?，拋出異?/p>

throw new NullPointerException("圖書不存在");

}

}

}catch(NullPointerException e){

e.printStackTrace();//捕捉到異常后輸出異常位置

System.out.println("請(qǐng)重新輸入：");

InputClassException();//重新進(jìn)入系統(tǒng)

}

break;

case 2://查找序號(hào)

System.out.println("請(qǐng)輸入您要借閱的圖書序號(hào)：");

int i=in.nextInt();

try{

if(i<books.length&&i>=0){//如果查詢的序號(hào)不越界，輸出書本信息

System.out.println("查詢成功");

System.out.println("您查詢的是"+books[i]);

}else{//越界則拋出數(shù)組越界異常

throw new ArrayIndexOutOfBoundsException("序號(hào)錯(cuò)誤");

}

}catch(ArrayIndexOutOfBoundsException e){

e.printStackTrace();//捕捉到異常后輸出異常位置

System.out.println("請(qǐng)重新輸入：");

InputClassException();//重新進(jìn)入系統(tǒng)

}

break;

}

in.close();

}catch(InputMismatchException e){

System.out.println("請(qǐng)輸入整數(shù)1或2");

e.printStackTrace();

System.out.println("請(qǐng)重新輸入：");

InputClassException();

}

}

}