Question

我想做的是保存游戏的所有得分，但似乎只是在覆盖第一行，而不是将它们添加到下一行。我需要你的帮助！预先谢谢你！

System.out.print("Enter Your Name: ");
    String name = inputName.nextLine();

    try {
        File highscore = new File("highscore.txt");

        PrintWriter output = new PrintWriter(highscore);
        if (highscore.exists()) {
            System.out.println("Score has been saved!");
        }           
        output.println(name + " - " + score);
        output.close();

    } catch (IOException e) {
        System.out.println(e);
    }
}

Answer 1

要以附加模式打开文件，必须使用FileWriter(String fileName, boolean appender)构造函数。

output = new BufferedWriter(new FileWriter(file_name, true));

添加以上行，它应该可以工作。

Answer 2

代替

output.println()

使用

output.append()

应该起作用...

Answer 3

使用PrintWriter output = new PrintWriter(new FileWriter(highscore, true));代替PrintWriter output = new PrintWriter(highscore);

由于构造函数中的第二个参数告诉FileWriter 将输入追加到文件中而不是覆盖它。

 public class StreamFilter {

     public static void main(String[] args) {
         System.out.print("Enter Your Name: ");
         Scanner inputName = new Scanner(System.in);
         String score="hui";
         String name = inputName.nextLine();

            try {
                File highscore = new File("highscore.txt");

                PrintWriter output = new PrintWriter(highscore);//remove this
PrintWriter output = new PrintWriter(new FileWriter(highscore, true));//usethis,
                if (highscore.exists()) {
                    System.out.println("Score has been saved!");
                }           
                output.println(name + " - " + score);
                output.close();

            } catch (IOException e) {
                System.out.println(e);
            }
        }
    }

Java：如何在现有文本文件中添加新的String行？

3 个答案: