content: package com.alibaba.fastjson2.fieldbased;
  
  import com.alibaba.fastjson2.JSON;
  import com.alibaba.fastjson2.JSONB;
  import com.alibaba.fastjson2.JSONReader;
  import com.alibaba.fastjson2.JSONWriter;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  public class Case1 {
      @Test
      public void test() {
          Bean bean = new Bean();
          bean.userId = 101;
          bean.UserId = 102;
  
          String str = JSON.toJSONString(bean, JSONWriter.Feature.FieldBased);
          assertEquals("{\"UserId\":102,\"userId\":101}", str);
          Bean bean1 = JSON.parseObject(str, Bean.class);
          assertNotNull(bean1);
          assertEquals(bean.userId, bean1.userId);
          assertEquals(bean.UserId, bean1.UserId);
      }
  
      @Test
      public void test_arrayMapping() {
          Bean bean = new Bean();
          bean.userId = 101;
          bean.UserId = 102;
  
          String str = JSON.toJSONString(bean, JSONWriter.Feature.FieldBased, JSONWriter.Feature.BeanToArray);
          assertEquals("[102,101]", str);
          Bean bean1 = JSON.parseObject(str, Bean.class, JSONReader.Feature.SupportArrayToBean);
          assertNotNull(bean1);
          assertEquals(bean.userId, bean1.userId);
          assertEquals(bean.UserId, bean1.UserId);
      }
  
      @Test
      public void test_jsonb() {
          Bean bean = new Bean();
          bean.userId = 101;
          bean.UserId = 102;
  
          byte[] jsonbBytes = JSONB.toBytes(bean, JSONWriter.Feature.FieldBased);
          Bean bean1 = JSONB.parseObject(jsonbBytes, Bean.class);
          assertNotNull(bean1);
          assertEquals(bean.userId, bean1.userId);
          assertEquals(bean.UserId, bean1.UserId);
      }
  
      @Test
      public void test_jsonb_arrayMapping() {
          Bean bean = new Bean();
          bean.userId = 101;
          bean.UserId = 102;
  
          byte[] jsonbBytes = JSONB.toBytes(bean, JSONWriter.Feature.FieldBased, JSONWriter.Feature.BeanToArray);
          Bean bean1 = JSONB.parseObject(jsonbBytes, Bean.class, JSONReader.Feature.SupportArrayToBean);
          assertNotNull(bean1);
          assertEquals(bean.userId, bean1.userId);
          assertEquals(bean.UserId, bean1.UserId);
      }
  
      @Test
      public void test_jsonb_arrayMapping_autoType() {
          Bean bean = new Bean();
          bean.userId = 101;
          bean.UserId = 102;
  
          byte[] jsonbBytes = JSONB.toBytes(bean, JSONWriter.Feature.FieldBased, JSONWriter.Feature.BeanToArray, JSONWriter.Feature.WriteClassName);
          Bean bean1 = JSONB.parseObject(jsonbBytes, Bean.class, JSONReader.Feature.SupportArrayToBean, JSONReader.Feature.SupportAutoType);
          assertNotNull(bean1);
          assertEquals(bean.userId, bean1.userId);
          assertEquals(bean.UserId, bean1.UserId);
      }
  
      public static class Bean {
          public int userId;
          public Integer UserId;
      }
  }
  