@Test
public void codeC() throws Exception {

    UserInfo info = new UserInfo(20, "wuhulala");
    byte[] b = jdkCodeC(info);
    System.out.println("jdk serializable length is : " + b.length);
    printSeparator();
    System.out.println("custom serializable length is : " + info.codeC().length);
    //jdk serializable length is : 113
    //--------------------------------------------------------
    //custom serializable length is : 16
}