java - 获取 Java.io.FileNotFoundException；在程序中并且不知道如何修复

Question

自己构建一个小游戏作为一个小项目，我不太擅长错误处理等，所以我收到了 java.io.FileNotFoundException 错误，但我没有确定如何继续。

这是我在这里发表的第一篇文章，所以我为如此含糊而道歉，我猜我需要抛出异常或以某种方式捕获它？

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

public class GameOver extends Actor {
    public static Counter highScore;
    public static int currentScore;
    /**
     * Act - do whatever the gameOver wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() {
        displayScore();
        if(Greenfoot.isKeyDown("space")) {
            Greenfoot.setWorld(new City());
        }
    } 
    //This is where I am getting the error 
    private void displayScore() {
        highScore = new Counter ("HIGHSCORE: ");
        getWorld().addObject(highScore, 700, 50); //Add width/height
        highScore.setLocation(City.WIDTH/2, City.HEIGHT/4);
        currentScore = (0+City.score);
        int topScore;
        //The error is coming from this block of code
        BufferedReader saveFile = new BufferedReader(new FileReader("TextSave.txt"));
        topScore = Integer.parseInt(saveFile.readLine()); 
        saveFile.readLine();
        saveFile.close();
        if (topScore < currentScore) {
            FileWriter writer = new FileWriter("topScore.txt");
            writer.write(currentScore);
            writer.close();
        }
        highScore.setValue(topScore);
    }
}

Answer 1

您的问题是“如何捕获异常”，这是一个答案:

    //This is where I am getting the error 
    private void displayScore() {
        highScore = new Counter ("HIGHSCORE: ");
        getWorld().addObject(highScore, 700, 50); //Add width/height
        highScore.setLocation(City.WIDTH/2, City.HEIGHT/4);
        currentScore = (0+City.score);
        int topScore;
        try{
          //The error is coming from this block of code
          BufferedReader saveFile = new BufferedReader(new FileReader("TextSave.txt"));
          topScore = Integer.parseInt(saveFile.readLine()); 
          saveFile.readLine();
          saveFile.close();
          if (topScore < currentScore) {
              FileWriter writer = new FileWriter("topScore.txt");
              writer.write(currentScore);
              writer.close();
          }
          highScore.setValue(topScore);
        catch(FileNotFoundException e){
          // Handle your exception here, like print a message 'the file XXX couldn't be read'
        }
    }

或者您可以将其传递给调用函数并在那里处理它:

private void displayScore() throws FileNotFoundException {
   ...
}