java - 用文本文件存储和显示多个用户的信息

Question

我正在编写一个程序，允许用户玩老虎机，然后将他们的姓名和分数存储到文本文件中。在程序开始和老虎机游戏结束时，有一个包含三个选项的菜单供用户选择:

1. 玩新游戏
2. 查看分数
3. 退出游戏。

当用户按下2时，程序应该显示每场比赛的分数，而不仅仅是刚刚玩的比赛；因此，每当用户玩游戏时，他们的信息都应 append 到已有的文件 score.txt 中。

我的问题是，每当我尝试读取此文件时，它只显示刚刚玩的游戏的分数。这是游戏结束后运行的代码:

System.out.println("Game over! Your score has been written to scores.txt" + name + "!"); 
System.out.print("Actions:\n");
System.out.println("1. Start a new game\n" + 
    "2. View scores\n" + 
    "3. Exit ");

System.out.println("Please select an action: ");
action = keyboard.nextInt();

while (action == 2) {
    File myFile = new File("score.txt");
    Scanner inputFile = new Scanner(myFile);

    if (myFile.exists()) {
        while (inputFile.hasNext()) {
            name = inputFile.nextLine();
            System.out.println("Name\n------\n" + name + "\n");
            total = inputFile.nextDouble();
            System.out.printf("Scores\n------\n$%.2f\n", total);
            System.out.println();   
        }
    } else
        System.out.println("There are no scores to display at this time.");

    System.out.print("Actions:\n");
    System.out.println("1. Start a new game\n" + 
            "2. View scorse\n" + 
            "3. Exit ");

    System.out.println("Please select an action: ");
    action = keyboard.nextInt();
}

Answer 1

如果您使用的是 FileWriter，请确保为要 append 的第二个参数传递 true。

try {
    PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("score.txt", true)));
    out.println(score);
    out.close();
} catch (IOException e) {
    //deal with the exception
}