의문점

package com.XX.XXX.dao;
 
import java.util.List;
import java.util.Map;
import com.XX.XXX.BoardVO;
 
 
 
public interface BoardDAO {
 
    public void create(BoardVO vo) throws Exception;
    
    public List<BoardVO> listAll() throws Exception;
    
    public BoardVO read(Integer bno) throws Exception;
    
    public void remove(Integer bno) throws Exception;
    
    public void modify(BoardVO vo) throws Exception;
    
    
    
}
 

이걸 작성했는데

그냥 작성할때는

import java.util.Map;