package?test3;

import?java.util.Scanner;

public?class?M2?{

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

?System.out.println("***歡迎來到圖書館系統***");

?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);

??M2?clc=new?M2();

??try{int?a=input.nextInt();

???if(a==1){System.out.println("輸入圖書名稱：");

???

????String?b=input.next();

????

????clc.book(b);

???}

???else?if(a==2){

???System.out.println("輸入圖書序號：");

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

???clc.book2(c);

??}

????}catch(Exception?e){

????e.printStackTrace();

????System.out.println("命令輸入錯誤！請根據提示輸入數字命令！");

????

?????

????}

??

}????String?name;

???????public?void?book(String?name)?throws?Exception{?

?????????this.name=name;

????????if(name.equals("高數")){System.out.println("book:"+name);}

????????else?if(name.equals("數據結構")){System.out.println("book:"+name);

????????

????????}else{throw?new?Exception("圖書不存在！");}

???????}int?num=0;

???????public?void?book2(int?num)?throws?Exception{

????????this.num=num;

????????if(num==1){System.out.println("book:高數");}

????????else?if(num==2){System.out.println("book:數據結構");}

????????else{throw?new?Exception("圖書不存在！");}

???????}

}