Question

如何将highscore以高位顺序附加到正确位置的highscore.txt文件中？该方法使用先前创建的readHighScore（int score）方法来查找应插入记录的行号。这是我到目前为止所得到的：

public static void recordHighScore(String name, int score){
            File file = new File("Test/highscore.txt");
            FileWriter fwriter = new FileWriter(file, true);
            try{
                String userName = name+","+score;
                fwriter.add(readHighScore(score), userName);

            }catch(IOException io){
                System.out.println("Missing File!");

            }

            /*Writes the high score into highscore.txt file, at the correct position (in descending order). This
            method uses readHighScore( ) method to find the line number where the record should be
            inserted.*/
        }

Answer 1

如果你想在最后附加数据，这很容易，如果你想在中间附加数据，几乎是不可能的。很容易读取内存中的所有文件，更改它并再次保存所有文件，覆盖旧的信息。

例如：

// read file to arraylist
Scanner s = new Scanner(new File("filepath"));
List<Score> list = new ArrayList<Score>();
while (s.hasNext()){
    String[] a = s.next().split(","); 
    list.add(new Score(a[0], a[1]); ); // Score is class with name and score fields
}
s.close();

// working with List<Score>
// add new score to List<Score>
// save List<Score> to file like in your code

如何在java中追加文件

1 个答案: