public?class?Borrow?{	
????public?static?void?main(String[]?args)?throws?CommandException,?NoResultException?{		
????????Borrow?borrow?=?new?Borrow();		
????????borrow.select();	
????}	
????public?void?select()?throws?CommandException,?NoResultException?{		
????????String[]?books?=?{"西游記",?"紅樓夢",?"水滸傳",?"三國演義"};		
????????Scanner?input?=?new?Scanner(System.in);		
????????try?{			
????????????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?ipt1?=?input.nextInt();			
????????????if?(ipt1?==?1)?{				
????????????????System.out.println("輸入圖書名稱:");				
????????????????String?ipt2?=?input.next();				
????????????????String?result?=?"";				
????????????????for?(String?book?:?books)?{					
????????????????????if?(ipt2.contentEquals(book))?{						
????????????????????????result?=?book;					
????????????????????}				
????????????????}				
????????????????if?(result?!=?"")?{					
????????????????????System.out.println("book:"?+?result);				
????????????????}?else?{					
????????????????????throw?new?NoResultException("圖書不存在!");				
????????????????}			
????????????}?else?if?(ipt1?==?2)?{				
????????????????System.out.println("輸入圖書序號:");				
????????????????int?ipt3?=?input.nextInt();				
????????????????if?(ipt3?>?books.length?||?ipt3?<=?0)?{					
????????????????????throw?new?NoResultException("圖書不存在!");				
????????????????}?else?if?(ipt3?>?0?&&?ipt3?<=?books.length)?{					
????????????????????System.out.println("book:"?+?books[ipt3?-?1]);				
????????????????}?else?{					
????????????????????throw?new?CommandException("命令輸入錯誤!請根據提示輸入數字命令!");				
????????????????}			
????????????}?else?{				
????????????????throw?new?CommandException("命令輸入錯誤!請根據提示輸入數字命令!");			
????????????}		
????????}?catch?(CommandException?e)?{			
????????????System.out.println(e.getMessage());			
????????????select();		
????????}?catch?(NoResultException?e)?{			
????????????System.out.println(e.getMessage());			
????????????select();		
????????}?catch?(InputMismatchException?e)?{			
????????????System.out.println("命令輸入錯誤!請根據提示輸入數字命令!");			
????????????select();		
????????}	
????}
}
public?class?CommandException?extends?Exception?{	
????public?CommandException()?{	}	
????public?CommandException(String?e)?{		
????????super(e);	
????}
}
public?class?NoResultException?extends?Exception?{	
????public?NoResultException()?{?}	
????public?NoResultException(String?e)?{		
????????super(e);	
????}
}