How can I modify the code of saving score so it can work on Android mode?

The code works on one of my games on Java mode. But on another game that I want to run only in Android mode does not work. The code I created is:

class Score {
  PrintWriter writer;
  String[] reader = loadStrings("scores.txt");
  int data;
  int data2;
  int data3;

  Score() {
    data  = 0;
    data2 = 0;
    data3 = 0;
  }
  Score(int receiver, int receiver2, int receiver3) {
    data  = receiver;
    data2 = receiver2;
    data3 = receiver3;
  }

  void write() {
    int[] collection = {data, data2, data3};
    writer = createWriter("scores.txt");
    for (int i = 0; i < collection.length; i++)
    writer.println(collection[i]);
    writer.flush();
    writer.close();
  }

    int read() {
    int piece = 0;
    piece  = int(reader[0]);
    return piece;
  }
    int read2() {
    int piece2 = 0;
    piece2 = int(reader[1]);
    return piece2;
  }
    int read3() {
    int piece3 = 0;
    piece3 = int(reader[2]);
    return piece3;
  }
}// End Class