//自定義異常1：命令錯誤異常

package com.imooc.exceptionTest;

public class wrongCommandException extends Exception {

????? public wrongCommandException() {

?? }

????? public wrongCommandException(String message) {

????? super(message);

?? }

}

//自定義異常2：圖書不存在異常

package com.imooc.exceptionTest;

public class wrongNameException extends Exception {

????? public wrongNameException() {

?? }

????? public wrongNameException(String message) {

????? super(message);

?? }

}

//測試類

package com.imooc.exceptionTest;

import java.util.Arrays;

import java.util.Scanner;

?

public class BorrowE {

?? public static void main(String[] args) {

????? BorrowE borrow = new BorrowE();

????? borrow.select();

?? }

?? public void select() {

????? String[] books = new String[] {"數(shù)據(jù)結構","Java從入門到精通","計算機網(wǎng)絡","操作系統(tǒng)","數(shù)字圖像處理"};

????? System.out.println("輸入命令：1-按照名稱查找圖書； 2-按照序號查找圖書");

????? Scanner input = new Scanner(System.in);

????? try{

??????? if(input.hasNextInt()) {

?????????? int in = input.nextInt();

?????????? if(in==1) {

????????????? System.out.println("輸入圖書名稱：");

????????????? Scanner input2 = new Scanner(System.in);

????????????? String inM = input2.nextLine();

????????????? boolean flag = Arrays.asList(books).contains(inM);

????????????? if(flag) {

???????????????? System.out.println(inM+"存在！");

????????????? }else {

???????????????? throw new wrongNameException();

????????????? }

?????????? }else if(in==2) {

????????????? System.out.println("輸入圖書序號：");

????????????? int inN = input.nextInt();

????????????? if(inN>=0 && inN<books.length) {

???????????????? System.out.println("你要查詢的圖書名稱為："+books[inN]);

????????????? }else {

????????????? ?? throw new wrongNameException();

????????????? }

?????????? }else {

????????????? throw new wrongCommandException();

?????????? }

??????? }else {

?????????? throw new wrongCommandException();

??????? }

????? }catch(wrongCommandException e){

??????? System.out.println("命令錯誤！請根據(jù)提示輸入數(shù)字命令！");

??????? select();

????? }catch(wrongNameException e) {

??????? System.out.println("圖書不存在！");

??????? select();

????? }

?? }

}