content: package com.alibaba.fastjson2.issues_2400;
  
  import com.alibaba.fastjson.JSON;
  import lombok.Data;
  import org.junit.jupiter.api.Test;
  
  import java.util.EnumMap;
  import java.util.EnumSet;
  import java.util.concurrent.TimeUnit;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  public class Issue2423 {
      @Test
      void test() {
          Bean bean = new Bean();
  
          String jsonStr = com.alibaba.fastjson.JSON.toJSONString(bean);
          Bean object = JSON.parseObject(jsonStr, Bean.class);
          assertTrue(object.getSet().isEmpty());
          assertTrue(object.getMap().isEmpty());
          assertEquals(bean, object);
  
          jsonStr = com.alibaba.fastjson2.JSON.toJSONString(bean);
          object = com.alibaba.fastjson2.JSON.parseObject(jsonStr, Bean.class);
          assertTrue(object.getSet().isEmpty());
          assertTrue(object.getMap().isEmpty());
          assertEquals(bean, object);
      }
  
      @Data
      static class Bean {
          private EnumSet<TimeUnit> set = EnumSet.noneOf(TimeUnit.class);
          private EnumMap<TimeUnit, Integer> map = new EnumMap<>(TimeUnit.class);
      }
  }
  