Question

请帮忙。我试图让程序访问名为“highscore.txt”的文件，然后：

1：在文件中写一个新号码

2：获取文件中数字列表的最低值。

如果您知道如何，请发布代码。

***注意：我是Java的新手，所以我几乎不知道如何访问文件***

编辑：

我得到了我认为应该有效的代码，但是当我运行该程序时，它会说

    Exception in thread "main" java.util.InputMismatchException
        at java.util.Scanner.throwFor(Scanner.java:864)
        at java.util.Scanner.next(Scanner.java:1485)
        at java.util.Scanner.nextDouble(Scanner.java:2413)
        at game.game.main(game.java:91)
    Java Result: 1

这是第84-94行，以及我得到的代码。

    84: Writer wr = new FileWriter("highscore.txt");
    85:            wr.write(tries);
    86:            wr.close();
    87:            lowest = tries;
    88:            File file = new File("highscore.txt");
    89: Scanner inputFile = new Scanner(file);
    90: while (inputFile.hasNext()) {
    91:    numb = inputFile.nextDouble();
    92:    if (numb < lowest) lowest = number;
    93: }
    94: inputFile.close();

编辑：

我有点工作。有一个错误，它只是在文本文件中放置一个随机的Unicode符号。以下是该部分的代码：

    try {

        int content = tries;

        File file = new File("highscore.txt");

        // if file doesnt exists, then create it
        if (!file.exists()) {
            file.createNewFile();
        }

        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write(content);
        bw.close();

    } catch (IOException e) {
        e.printStackTrace();
    }
                Writer wr = new FileWriter("highscore.txt");
                wr.write(tries);
                wr.close();
                lowest = tries;
                File file = new File("highscore.txt");
    Scanner inputFile = new Scanner(file);
    while (inputFile.hasNextInt()) {
        numb = inputFile.nextInt();
        if (numb < lowest) lowest = numb;
    }

文件：

Answer 1

试试这个..

        int tries = 8;
    // Writing to the file
    try {
        int content = tries;

        File file = new File("highscore.txt");

        // if file doesnt exists, then create it
        if (!file.exists()) {
            file.createNewFile();
        }

        PrintWriter pw = new PrintWriter(new FileWriter(file, true));
        pw.println(content);
        pw.close();
        /*
         * FileWriter fw = new FileWriter(file.getAbsoluteFile());
         * BufferedWriter bw = new BufferedWriter(fw); bw.write(content);
         * bw.close();
         */
    } catch (IOException e) {
        e.printStackTrace();
    }
    /*
     * Writer wr; try { wr = new FileWriter("highscore.txt");
     * wr.write(tries); wr.close(); } catch (Exception e) {
     * 
     * }
     */

    // Getting the minimum score from the file
    int lowest = tries;
    File file = new File("highscore.txt");
    Scanner inputFile;
    try {
        inputFile = new Scanner(file);
        while (inputFile.hasNextInt()) {
            int numb = inputFile.nextInt();
            if (numb < lowest)
                lowest = numb;
        }
        System.out.println("lowest Score is: " + lowest);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

我需要使用文件来更新/获取高分信息

1 个答案: