package?com.study.bookstudy;

public?class?Main?{//主函數(shù)類

	public?static?void?main(String[]?args)?{
		Library?library?=?new?Library();
		library.run();
	}
}

package?com.study.bookstudy;

public?class?Book?{//Book類，基本的數(shù)據(jù)封裝
	private?int?num;
	private?String?name;

	public?Book(int?num,?String?name)?{
		this.num?=?num;
		this.name?=?name;
	}

	public?int?getNum()?{
		return?num;
	}

	public?String?getName()?{
		return?name;
	}

}

package?com.study.bookstudy;

public?class?BookNotExistException?extends?Exception?{
//自定義異常類??-?圖書不存在異常
	public?BookNotExistException()?{
		System.out.println("圖書不存在，請重新輸入。");
	}

}

package?com.study.bookstudy;

import?java.util.ArrayList;
import?java.util.InputMismatchException;
import?java.util.List;
import?java.util.Scanner;

public?class?Library?{//最主要的類，管理圖書，以及處理搜索請求
	private?List<Book>?books;
	private?Scanner?scanner;

	public?Library()?{
		books?=?new?ArrayList<Book>();
		scanner?=?new?Scanner(System.in);
		init();
	}

	public?void?run()?{//啟動圖書館類，也可以擴展其他業(yè)務(wù)
		searchService();
		System.out.println("謝謝使用！");
	}

	private?void?searchService()?{//搜索服務(wù)
		Book?book?=?null;
		while?(true)?{
			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");
			int?choose?=?getRightNumber();
			switch?(choose)?{//?寫成switch形式，便于以后功能擴展
			case?1:
				System.out.println("輸入圖書名稱：");
				String?searchStr?=?scanner.next();
				try?{
					book?=?searchByName(searchStr);
					showBookInfo(book);
					return;
				}?catch?(BookNotExistException?e)?{
					continue;
				}

			case?2:
				System.out.println("輸入圖書編號：");
				int?searchNum?=?getRightNumber();
				try?{
					book?=?searchByNum(searchNum);
					showBookInfo(book);
					return;
				}?catch?(BookNotExistException?e)?{
					continue;
				}
			default:
				break;
			}
		}
	}

	//顧名思義，通過名字搜索
	private?Book?searchByName(String?name)?throws?BookNotExistException?{
		for?(Book?book?:?books)?{
			if?(book.getName().equals(name))?{
				return?book;
			}
		}
		throw?new?BookNotExistException();
	}

	//顧名思義，通過編號搜索
	private?Book?searchByNum(int?num)?throws?BookNotExistException?{
		for?(Book?book?:?books)?{
			if?(book.getNum()?==?num)?{
				return?book;
			}
		}
		if?(num?>?books.size()?||?num?<?1)?{
			throw?new?BookNotExistException();
		}
		return?null;
	}

	//獲得正確的數(shù)字輸入
	private?int?getRightNumber()?{
		int?choose;
		while?(true)?{
			try?{
				choose?=?scanner.nextInt();
				break;
			}?catch?(InputMismatchException?e)?{
				System.out.println("命令錯誤，請重新輸入。");
				scanner.next();//?清楚緩沖區(qū)無效的string字符
			}
		}

		return?choose;
	}

	//顯示信息
	private?void?showBookInfo(Book?book)?{
		System.out.println("編號："?+?book.getNum()?+?"\t書名："?+?book.getName());
	}

	//初始化數(shù)據(jù)
	private?void?init()?{
		books.add(new?Book(1,?"book_1"));
		books.add(new?Book(2,?"book_2"));
		books.add(new?Book(3,?"book_3"));
		books.add(new?Book(4,?"book_4"));
		books.add(new?Book(5,?"book_5"));
		books.add(new?Book(6,?"book_6"));

	}
}