content: package com.alibaba.json.bvt.issue_1700;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.JSONObject;
  import com.alibaba.fastjson.annotation.JSONField;
  import junit.framework.TestCase;
  
  public class Issue1739 extends TestCase {
      public void test_for_issue() throws Exception {
          M0 model = new M0();
          model.data = new JSONObject();
  
          String json = JSON.toJSONString(model);
          assertEquals("{\"data\":{}}", json);
      }
  
      public void test_for_issue_1() throws Exception {
          M1 model = new M1();
          model.data = new JSONObject();
  
          String json = JSON.toJSONString(model);
          assertEquals("{}", json);
      }
  
      public static class M0 {
          private JSONObject data;
  
          @JSONField(deserialize = false)
          public JSONObject getData() {
              return data;
          }
  
          public void setData(JSONObject data) {
              this.data = data;
          }
      }
  
      public static class M1 {
          private JSONObject data;
  
          @JSONField(serialize = false)
          public JSONObject getData() {
              return data;
          }
  
          public void setData(JSONObject data) {
              this.data = data;
          }
      }
  }
  