我试图让我的程序有一个恢复功能，它存储所有保存的内容从以前的示例时，用户按下e，然后当程序重新运行，从该文件读取恢复以前的状态（读/写到） ArrayList ). 但是，当我尝试写入文件时，文件确实保存了内容，但当重新启动时，文件被清除。我正在使用 PrintWriter 并附加到我的当前文件进行保存。
这是我的write to file类：

public class fileWrite {

  /* Init writing file PrintWriter objects */
  PrintWriter outFile;
  PrintWriter writeUserInput;

  {
    /* init writer to store all footballclubs current in the league */
    try {
      outFile = new PrintWriter("addcontents.txt");
    } catch(FileNotFoundException e) {
      System.out.println("File failed to be created to save this instance.");
    }
  }

  public fileWrite() {

}

  /* Append a String to the file */
  public void appendString(String s) {
    writeUserInput.append(s + "\n");
    writeUserInput.flush();
  }
  /* Append an Int to the file */
  public void appendInt(int number) {
    writeUserInput.print(number + "\n");
    writeUserInput.flush();
  }
  /* Loop through clubs array and save all information regarding clubs inside file */
  public void storeClubs(ArrayList < FootballClub > footballClubsList) {
    for (FootballClub x: footballClubsList) {
      outFile.println(x.toString());
    }
  }
  /* Close the file writing object */
  public void closeFile() {
    outFile.close();
  }

}