Untitled

only first contact gets deleted
public void deleteActionPerformed(ActionEvent ae) {
  String delname=tf4.getText();
  int c=0;
  try {
    ObjectInputStream ois=new ObjectInputStream(new FileInputStream("data.txt"));
    data=(Object[][])ois.readObject();

    for(;;c++) {
      String x=(String)data[c][0];
      if(x.equals(delname)) {
        System.out.println("if working");
        data[c][0]=null;
        data[c][1]=null;
        data[c][2]=null;
        try {
          ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("data.txt"));
          oos.writeObject(data);
        } catch(Exception exc) {
          System.out.println("error deleting data from"+" "+c+" row");
        }
        c++;
        JOptionPane.showMessageDialog(new JFrame(),"contact deleted");
        try {
          ObjectInputStream oist=new ObjectInputStream(new FileInputStream("data.txt"));
          data=(Object[][])oist.readObject();
          JTable tb=new JTable(data,headers);
          ObjectOutputStream oost=new ObjectOutputStream(new FileOutputStream("contacts.txt"));
          oost.writeObject(tb);
        } catch(Exception exc) {
          System.out.println("error updating after deleting");
        }

      }
      else
        System.out.println("else working");


    }
  } catch(Exception exc) {
    System.out.println("error reading data.txt for deleting");
  }
}