public void FileWrite(Informations ifm) throws ClassNotFoundException {
  Vector vc = new Vector();
  FileInputStream fis = null;
  ObjectInputStream ois = null;
  BufferedOutputStream bos = null;
  ObjectOutputStream oos = null;
  FileOutputStream fos = null;
  
  try {
   File filec = new File("5215.txt");
   if (filec.exists()) {
    fis = openFileInput("5215.txt");
    ois = new ObjectInputStream(fis);
    vc = (Vector) ois.readObject();
    ois.close();
   }  Toast.makeText(this, "sdcard", Toast.LENGTH_SHORT).show();
  fos = openFileOutput("5215.txt", MODE_APPEND);
   bos = new BufferedOutputStream(fos);
   oos = new ObjectOutputStream(new BufferedOutputStream(bos));
   vc.add(ifm);
   oos.writeObject(vc);  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   Log.i("에러", "에러결국남");
   Toast.makeText(this, "fos IOException", Toast.LENGTH_SHORT).show();
  } finally {
   try {
    oos.close();
    bos.close();
    vc.clear();
    fos.close();
    Toast.makeText(this, "잘댐", Toast.LENGTH_SHORT).show();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }


class Informations implements Serializable {
 private Date date;
 private double wido;
 private double kyengdo;
 private static final long serialVersionUID = 1L;
 
 public Informations(){
  wido = 1.111;
  kyengdo=1.1111;
  date = new Date();
 }
 public Informations(Date date, double wido, double kyengdo)
   throws IOException {
  this.date = date;
  this.wido = wido;
  this.kyengdo = kyengdo;
 }
}

try {
     FileInputStream fis = openFileInput("5215.txt");
     ObjectInputStream ois = new ObjectInputStream(fis);
     vc = (Vector) ois.readObject();
     String str=null;
     for(int a=0; a<vc.size(); a++){
      Informations info = (Informations) vc.elementAt(a);
      str = str + info.result();
      System.out.println(vc.size());
      Log.i("에러1", Integer.toString(vc.size()));
     }
     show.setText(Integer.toString(vc.size()));
     ois.close();
    } catch (StreamCorruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    } catch (ClassNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }