新手求教input cannot be resolved

inputStr cannot be resolved
    posStrArr cannot be resolved
    posStrArr cannot be resolved
怎么解决这个错误，这个包我找不到啊，大神。inputStr cannot be resolved
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你发个这个过来，我们怎么看的懂？
把整个程序发出来呀！

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import java.awt.event.InputEvent;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Gobang
{
     private String[][] board;
     private static int BOARD_SIZE=15;
     public void initBoard()
     {
         board=new String[BOARD_SIZE][BOARD_SIZE];
         for(int i=0;i<BOARD_SIZE;i++)
         {
             for(int j=0;j<BOARD_SIZE;j++)
             {
                 board[i][j]="╋";
             }
         }
     }
    public void printBoard()
    {
        for(int i=0;i<BOARD_SIZE;i++)
        {
            for(int j=0;j<BOARD_SIZE;j++)
            {
                System.out.print(board[i][j]);
            }
                 System.out.print("\n");
        }   
    }
    public static void main(String[] args) throws Exception
    {
        Gobang bg=new Gobang();
        bg.initBoard();
        bg.printBoard();
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String inputstr=null;
        while((inputstr=br.readLine())!=null)
        {
            String[] possStrArr=InputEvent.split(",");
            int xPos=Integer.parseInt(posStrArr[0]);
            int yPos=Integer.parseInt(posStrArr[1]);
            bg.board[yPos-1][xPos-1]="●";
            bg.printBoard();
            System.out.println("请乱来，应格式为：");
        }   
    }
   
}
其实是李刚的疯狂JAVA讲义上的简易五子棋，但是课本没有import任何包，我加了两个，但是还有问题
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