package?booksystem;
import?java.util.*;

public?class?BookSystem?{
	String?book[]={"平凡的世界","高等數學","C程序設計"};
	Scanner?input=new?Scanner(System.in);
	public?static?void?main(String[]?args)?{
		BookSystem?begin=new?BookSystem();
		begin.welcome();
	}
	public?void?welcome(){
		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；");
		try{
			int?select=input.nextInt();
			if(select==1)
				this.searchName();
			else?if(select==2)
				this.searchNum();
			else?throw?new?Exception();
		}catch(Exception?e){
			System.out.println("請輸入正確的指令");
			input.nextLine();?//跳過錯誤類型
			this.welcome();?
		}
	}
	public?void?searchName(){
		System.out.println("請輸入圖書名稱:");
		String?bookname=input.next();
		System.out.println(bookname);
		Boolean?flag=false;
		for(int?i=0;i<book.length;i++)
			if(bookname.equals(book[i]))
				flag=true;
		if(flag)
			System.out.println("圖書："+bookname);
		else?System.out.println("圖書不存在");
		this.welcome();
	}
	public?void?searchNum(){
		System.out.println("請輸入圖書序號：");
		int?num=input.nextInt();
		if(num<=book.length)
			System.out.println("圖書:"+book[num-1]);
		else?System.out.println("圖書不存在");
		this.welcome();
	}

}