public static void main(String[] args) { test_email te1 = new test_email(123, "HI test"); System.out.println("Test Serializalbe."); System.out.println("The original email is: " + te1.title + " " + te1.content); String file_n = "test_email1"; try { Utility.write_to(te1, file_n); } catch (IOException e) { e.printStackTrace(); } test_email te2 = new test_email(); try { te2 = (test_email) Utility.read_from(file_n); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("The readout email is: " + te2.title + " " + te2.content); }