//Books.java,?處理圖書查詢流程的類

package?com.imooc.bookmanagement;

import?java.util.*;

public?class?Books?{
	private?String[]?book?=?{new?String("高數"),?new?String("數據結構")};	
	private?Scanner?c?=?null;
	private?boolean?flagNotFound?=?true;
	
	private?int?searchMethod()?throws?WrongCommandException{
		int?k?=?0;

			System.out.println("請輸入命令：1-按照名稱查找圖書；2-按照序號查找圖書");
			try{
				c?=?new?Scanner(System.in);
				k?=?c.nextInt();
				if?(k?==?1?||?k?==?2){
				}
				else{
					System.out.println("命令輸入錯誤！請根據提示輸入數字命令！");
					throw?new?WrongCommandException("命令輸入錯誤！");
				}
			}catch?(InputMismatchException?e){
				throw?new?WrongCommandException("命令輸入錯誤！");
			}

		return?k;
	}
	
	private?int?searchBookByName()?throws?BookDoesNotExistException{
		int?i?=?0;
		
		System.out.println("請輸入圖書名稱:");
		c?=?new?Scanner(System.in);
		String?s?=?c.next();
	
		for(i?=?0;?i?<?book.length;?i++){
			if(s.equals(book[i])){
				return?i;
			}
		}
		throw?new?BookDoesNotExistException("圖書不存在！");
		
	}
	
	private??int?searchBookByNumber()?throws?BookDoesNotExistException{
		int?i?=?0;
		
		System.out.println("請輸入圖書序號:");
		
		try{
			c?=?new?Scanner(System.in);
			int?s?=?c.nextInt();
			
			for(i?=?0;?i?<?book.length;?i++){
				if(s?==?i+1){
					return?i;
				}
			}
			throw?new?BookDoesNotExistException("圖書不存在！");
		}catch?(Exception?e){
			throw?new?BookDoesNotExistException("圖書不存在！");
		}
	}
	
	public?void?processing(){
		int?bookNumber;
		int?k?=?0;
		while(flagNotFound){
			try{
				k?=?searchMethod();
				if(k?==?1){
					try{
						bookNumber?=?searchBookByName();
						flagNotFound?=?false;
						System.out.println("book:"+book[bookNumber]);
					}catch?(BookDoesNotExistException?e){
						System.out.println("圖書不存在！");
						flagNotFound?=?true;
					}
							
				}
				else?if?(k?==?2){
					try{
						bookNumber?=?searchBookByNumber();
						flagNotFound?=?false;
						System.out.println("book:"+book[bookNumber]);
					}catch?(BookDoesNotExistException?e){
						System.out.println("圖書不存在！");
						flagNotFound?=?true;
					}
				}
			}catch(WrongCommandException?e){
				System.out.println("命令輸入錯誤！請根據提示輸入數字命令！");
				flagNotFound?=?true;
			}
		}
		if(c!=null)
			c.close();
	}
}

//BookDoesNotExistException.java,?圖書不存在異常類

package?com.imooc.bookmanagement;

public?class?BookDoesNotExistException?extends?Exception?{
	public?BookDoesNotExistException(){
		
	}
	
	public?BookDoesNotExistException(String?message){
		super(message);
	}

}

//WrongCommandException.java,?錯誤命令異常類

package?com.imooc.bookmanagement;

public?class?WrongCommandException?extends?Exception?{
	
	WrongCommandException(){
		
	}
	
	WrongCommandException(String?message){
		super(message);
	}

}

//BookManagement.java,?主類

package?com.imooc.bookmanagement;

public?class?BookManagement?{

	public?static?void?main(String[]?args)?{
		Books?book1?=?new?Books();
		book1.processing();

	}

}