package?borrow_books;
import?java.util.Scanner;
import?java.util.InputMismatchException;

public?class?Test?{
????int?command;	
????String?inName;	
????int?inNum;?	
????Scanner?input?=?new?Scanner(System.in);	
????Book[]?books?=?{new?Book("數(shù)據(jù)結構",?1),?new?Book("高數(shù)",?2)};
????		
????public?static?void?main(String[]?args)?{
????????while(true)?{
????????????Test?t?=?new?Test();
????????????t.inputCommand();
????????????if(t.command?==?1)?{
????????????????t.inputName();
????????????}else?if(t.command?==?2){
????????????????t.inputNumber();
????????????}
????????}
????}

????public?void?inputCommand()?{
????????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");
????????????command?=?input.nextInt();
????????????if((command?!=?1)?&&?(command?!=?2))?{
????????????????throw?new?ErrorCommandException();
????????????}
????????}catch(InputMismatchException?ie)?{
????????????ErrorCommandException?ee?=?new?ErrorCommandException();
????????????System.out.println(ee.getMessage());
????????}catch(ErrorCommandException?ee)?{
????????????System.out.println(ee.getMessage());
????????}
????}

????public?void?inputName()?{		
????????try?{			
????????????System.out.println("輸入圖書名稱");		
????????????inName?=?input.next();	
????????????for(int?i?=?0;?i?<?books.length;?i++)?{			
????????????????if(inName.equals(books[i].name))?{			
?????????????	????books[i].showBookName();					
?????????????	????return;				
?????????????	}			
????????????}			
????????????throw?new?BooknotExistException();		
????????}catch(Exception?e)?{		
????????????System.out.println(e.getMessage());		
????????}	
????}

????public?void?inputNumber()?{
????????while(true)?{			
????????????try?{			
????????????????System.out.println("輸入圖書序號");			
????????????????inNum?=?input.nextInt();				
????????????????for(int?i?=?0;?i?<?books.length;?i++)?{					
????????????????????if(inNum?==?books[i].number)?{						
????????????????????????books[i].showBookName();						
????????????????????????return;					
????????????????????}
????????????????}				
????????????????throw?new?BooknotExistException();			
????????????}catch(InputMismatchException?ie)?{				
????????????????input.nextLine();				
????????????????ErrorCommandException?ee?=?new?ErrorCommandException();				
????????????????System.out.println(ee.getMessage());			
????????????}catch(BooknotExistException?be)?{				
????????????????System.out.println(be.getMessage());				
????????????????return;			
????????????}		
????????}	
????}
}

package?borrow_books;

public?class?ErrorCommandException?extends?Exception?{	
????public?ErrorCommandException()?{		
????????super("命令輸入錯誤！請根據(jù)提示輸入數(shù)字命令！");	
????}
}

package?borrow_books;

public?class?BooknotExistException?extends?Exception?{	
????public?BooknotExistException()?{		
????????super("圖書不存在！");	
????}
}

package?borrow_books;

public?class?Book?{	
????String?name;	
????int?number;		
????
????public?Book(String?name,?int?number)?{	
????????this.name?=?name;	
????????this.number?=?number;	
????}
????
????public?void?showBookName()?{		
????????System.out.println("book:"+name);
????}
}