ジャワの国の新しい旅行記の11----異常で流れを制御します

import java.util.HashMap;
import java.util.Map;


public class LoginService{
    private Map<String,String> map;
    
    public LoginService(){
        map=new HashMap<String,String>();
        
        map.put(" ", "123");
        map.put(" ", "123");
        map.put(" ", "123");
        map.put(" ", "1234");
        map.put(" ", "1234");
    }
    
    
    public boolean login(String name,String password) throws NoUserException,ErrorPswdException{
        
        if(map.containsKey(name)){
            String pswd=map.get(name);
            
            if(pswd.equals(password)==false){
                throw new ErrorPswdException(" "+name+" "+password);
            }
        }else{
            throw new NoUserException("DB ");
        }
        
        return true;
    }
    
    public static void main(String[] args){
        LoginService service=new LoginService();
        String name=" 1";
        String pswd="1235";
        
        try{
            boolean passed=service.login(name,pswd);
            
            System.out.println(" "+name+" .");
        }catch(NullPointerException e){
            System.out.println(" ， .");
        }catch(NoUserException e){
            System.out.println(" "+name+" , ");
        }catch(ErrorPswdException e){
            System.out.println(" "+name+" "+pswd+" , ");
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

2つの例外クラス:

public class ErrorPswdException extends Exception{
    public ErrorPswdException(String msg){
        super(msg);
    }
}

public class NoUserException extends Exception{
    public NoUserException(String msg){
        super(msg);
    }
}