source: class UserInfoTest {
  
      private int count;
  
      @Test
      public void codeC() throws Exception {
  
target:         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
      }
  
  }