我试图写入一个json文件，它只是不工作，我没有得到任何错误，但没有任何变化的文件。
下面是我的代码的相关部分

try {
            //method1
            Gson gson = new Gson();
            String s = "gjsanhfhj";
            String path = this.getApplicationContext().getFilesDir().getAbsolutePath() + "/" + "test.json";

            File file = new File(path);
            file.setWritable(true);

            gson.toJson(s,new FileWriter(file));

            //method2
            FileOutputStream outputStream;
            outputStream = openFileOutput(path, Context.MODE_PRIVATE);
            outputStream.write(s.getBytes());
            outputStream.close();

            //method3
            Writer output;
            output = new BufferedWriter(new FileWriter(file));
            output.write(s);
            output.close();

            Toast.makeText(this.getApplicationContext(), "check", Toast.LENGTH_SHORT).show();

        } catch (Exception e) {
            e.printStackTrace();
        }

我试了上面的3种方法，都不起作用，我找不到其他的方法
我试过这个

public class PlayerData {
    private int gold;
    private int wins;
    private int losses;

    public PlayerData(){
        gold = 0;
        wins = 0;
        losses = 0;
    }

            Gson gson = new Gson();
            String path = this.getApplicationContext().getFilesDir().getAbsolutePath() + "/" + "test.json";
            File file = new File(path);
            file.setWritable(true);

            gson.toJson(new PlayerData(),new FileWriter(file));

不工作