diff --git a/easyexcel-core/src/main/java/com/alibaba/excel/util/ClassUtils.java b/easyexcel-core/src/main/java/com/alibaba/excel/util/ClassUtils.java
index 1447a078..f9a53e08 100644
--- a/easyexcel-core/src/main/java/com/alibaba/excel/util/ClassUtils.java
+++ b/easyexcel-core/src/main/java/com/alibaba/excel/util/ClassUtils.java
@@ -1,5 +1,20 @@
 package com.alibaba.excel.util;
 
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.concurrent.ConcurrentHashMap;
+
 import com.alibaba.excel.annotation.ExcelIgnore;
 import com.alibaba.excel.annotation.ExcelIgnoreUnannotated;
 import com.alibaba.excel.annotation.ExcelProperty;
@@ -19,6 +34,7 @@ import com.alibaba.excel.metadata.property.FontProperty;
 import com.alibaba.excel.metadata.property.NumberFormatProperty;
 import com.alibaba.excel.metadata.property.StyleProperty;
 import com.alibaba.excel.write.metadata.holder.WriteHolder;
+
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
@@ -27,11 +43,6 @@ import lombok.Setter;
 import org.apache.commons.collections4.CollectionUtils;
 import org.springframework.cglib.beans.BeanMap;
 
-import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
-import java.util.*;
-import java.util.concurrent.ConcurrentHashMap;
-
 /**
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
@@ -554,7 +565,7 @@ public class ClassUtils {
         FieldCacheKey(Class<?> clazz, ConfigurationHolder configurationHolder) {
             this.clazz = clazz;
             if (configurationHolder instanceof WriteHolder) {
-                WriteHolder writeHolder = (WriteHolder) configurationHolder;
+                WriteHolder writeHolder = (WriteHolder)configurationHolder;
                 this.excludeColumnFieldNames = writeHolder.excludeColumnFieldNames();
                 this.excludeColumnIndexes = writeHolder.excludeColumnIndexes();
                 this.includeColumnFieldNames = writeHolder.includeColumnFieldNames();