FileNotFoundException Java

Question

我正在试着为扫雷游戏做一个简单的高分系统。然而，我一直收到文件未找到异常，并且我也尝试使用文件的完整路径。

package minesweeper;

import java.io.*;
import java.util.*;

public class Highscore{

 public static void submitHighscore(String difficulty) throws IOException{
  int easy = 99999;
  int normal = 99999;
  int hard = 99999;
  //int newScore = (int) MinesweeperView.getTime();
  int newScore = 10;
  File f = new File("Highscores.dat");

  if (!f.exists()){
   f.createNewFile();

  } 
  Scanner input = new Scanner(f); 
  PrintStream output = new PrintStream(f);

  if (input.hasNextInt()){
   easy = input.nextInt();
   normal = input.nextInt();
   hard = input.nextInt();
  }

  output.flush();



  if(difficulty.equals("easy")){
   if (easy > newScore){
   easy = newScore;
   }
  }else if (difficulty.equals("normal")){
   if (normal > newScore){
   normal = newScore;
   }
  }else if (difficulty.equals("hard")){
   if (hard > newScore){
   hard = newScore;
   }
  }
  output.println(easy);
  output.println(normal);
  output.println(hard);

 }

//temporary main method used for debugging

 public static void main(String[] args) throws IOException {
  submitHighscore("easy");
 }  

}

Answer 1

您不会透露异常是在哪一行代码上发出的。(注意:没有发布所有关于这个问题的信息会降低你获得有用答案的机会。)

然而，我的直觉是它来自下面显示的第二次调用，在这种情况下，问题出在试图打开文件两次：

Scanner input = new Scanner(f); 
PrintStream output = new PrintStream(f);

Answer 2

您是否检查了该文件是否存在，并且您是否具有该文件的访问权限？

Answer 3

你试过这个吗？

if(f.isFile()) 
   System.out.println("Yes, we have a file");

if(f.canWrite()) 
   System.out.println("Yes, we have can write to the file");