diff --git a/hutool-core/src/main/java/cn/hutool/core/bean/BeanUtil.java b/hutool-core/src/main/java/cn/hutool/core/bean/BeanUtil.java
index b66b15f0d..84e7c5917 100644
--- a/hutool-core/src/main/java/cn/hutool/core/bean/BeanUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/bean/BeanUtil.java
@@ -225,8 +225,8 @@ public class BeanUtil {
 	 */
 	private static Map<String, PropertyDescriptor> internalGetPropertyDescriptorMap(Class<?> clazz, boolean ignoreCase) throws BeanException {
 		final PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(clazz);
-		final Map<String, PropertyDescriptor> map = ignoreCase ? new CaseInsensitiveMap<>(propertyDescriptors.length, 1)
-				: new HashMap<>((int) (propertyDescriptors.length), 1);
+		final Map<String, PropertyDescriptor> map = ignoreCase ? new CaseInsensitiveMap<>(propertyDescriptors.length, 1f)
+				: new HashMap<>(propertyDescriptors.length, 1);
 
 		for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
 			map.put(propertyDescriptor.getName(), propertyDescriptor);
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseLinkedMap.java b/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseLinkedMap.java
index fbd2b776c..639bfbfcc 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseLinkedMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseLinkedMap.java
@@ -1,7 +1,5 @@
 package cn.hutool.core.map;
 
-import cn.hutool.core.util.StrUtil;
-
 import java.util.LinkedHashMap;
 import java.util.Map;
 
@@ -15,7 +13,7 @@ import java.util.Map;
  * @param <V> 值类型
  * @since 4.0.7
  */
-public class CamelCaseLinkedMap<K, V> extends CustomKeyMap<K, V> {
+public class CamelCaseLinkedMap<K, V> extends CamelCaseMap<K, V> {
 	private static final long serialVersionUID = 4043263744224569870L;
 
 	// ------------------------------------------------------------------------- Constructor start
@@ -48,7 +46,7 @@ public class CamelCaseLinkedMap<K, V> extends CustomKeyMap<K, V> {
 	 * 构造
 	 *
 	 * @param loadFactor 加载因子
-	 * @param m Map
+	 * @param m Map，数据会被默认拷贝到一个新的LinkedHashMap中
 	 */
 	public CamelCaseLinkedMap(float loadFactor, Map<? extends K, ? extends V> m) {
 		this(m.size(), loadFactor);
@@ -65,18 +63,4 @@ public class CamelCaseLinkedMap<K, V> extends CustomKeyMap<K, V> {
 		super(new LinkedHashMap<>(initialCapacity, loadFactor));
 	}
 	// ------------------------------------------------------------------------- Constructor end
-
-	/**
-	 * 将Key转为驼峰风格，如果key为字符串的话
-	 *
-	 * @param key KEY
-	 * @return 驼峰Key
-	 */
-	@Override
-	protected Object customKey(Object key) {
-		if (key instanceof CharSequence) {
-			key = StrUtil.toCamelCase(key.toString());
-		}
-		return key;
-	}
 }
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseMap.java b/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseMap.java
index ea1642d14..4759b7202 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/CamelCaseMap.java
@@ -1,24 +1,24 @@
 package cn.hutool.core.map;
 
+import cn.hutool.core.util.StrUtil;
+
 import java.util.HashMap;
 import java.util.Map;
 
-import cn.hutool.core.util.StrUtil;
-
 /**
  * 驼峰Key风格的Map<br>
  * 对KEY转换为驼峰，get("int_value")和get("intValue")获得的值相同，put进入的值也会被覆盖
  *
- * @author Looly
- *
  * @param <K> 键类型
  * @param <V> 值类型
+ * @author Looly
  * @since 4.0.7
  */
-public class CamelCaseMap<K, V> extends CustomKeyMap<K, V> {
+public class CamelCaseMap<K, V> extends FuncKeyMap<K, V> {
 	private static final long serialVersionUID = 4043263744224569870L;
 
 	// ------------------------------------------------------------------------- Constructor start
+
 	/**
 	 * 构造
 	 */
@@ -48,7 +48,7 @@ public class CamelCaseMap<K, V> extends CustomKeyMap<K, V> {
 	 * 构造
 	 *
 	 * @param loadFactor 加载因子
-	 * @param m Map
+	 * @param m          初始Map，数据会被默认拷贝到一个新的HashMap中
 	 */
 	public CamelCaseMap(float loadFactor, Map<? extends K, ? extends V> m) {
 		this(m.size(), loadFactor);
@@ -59,24 +59,26 @@ public class CamelCaseMap<K, V> extends CustomKeyMap<K, V> {
 	 * 构造
 	 *
 	 * @param initialCapacity 初始大小
-	 * @param loadFactor 加载因子
+	 * @param loadFactor      加载因子
 	 */
 	public CamelCaseMap(int initialCapacity, float loadFactor) {
-		super(new HashMap<>(initialCapacity, loadFactor));
+		this(MapBuilder.create(new HashMap<>(initialCapacity, loadFactor)));
 	}
-	// ------------------------------------------------------------------------- Constructor end
 
 	/**
-	 * 将Key转为驼峰风格，如果key为字符串的话
+	 * 构造<br>
+	 * 注意此构造将传入的Map作为被包装的Map，针对任何修改，传入的Map都会被同样修改。
 	 *
-	 * @param key KEY
-	 * @return 驼峰Key
+	 * @param emptyMapBuilder Map构造器，必须构造空的Map
 	 */
-	@Override
-	protected Object customKey(Object key) {
-		if (key instanceof CharSequence) {
-			key = StrUtil.toCamelCase(key.toString());
-		}
-		return key;
+	CamelCaseMap(MapBuilder<K, V> emptyMapBuilder) {
+		super(emptyMapBuilder.build(), (key) -> {
+			if (key instanceof CharSequence) {
+				key = StrUtil.toCamelCase(key.toString());
+			}
+			//noinspection unchecked
+			return (K) key;
+		});
 	}
+	// ------------------------------------------------------------------------- Constructor end
 }
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveLinkedMap.java b/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveLinkedMap.java
index 51cdd2561..5be588ef3 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveLinkedMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveLinkedMap.java
@@ -13,7 +13,7 @@ import java.util.Map;
  * @param <V> 值类型
  * @since 3.3.1
  */
-public class CaseInsensitiveLinkedMap<K, V> extends CustomKeyMap<K, V> {
+public class CaseInsensitiveLinkedMap<K, V> extends CaseInsensitiveMap<K, V> {
 	private static final long serialVersionUID = 4043263744224569870L;
 
 	// ------------------------------------------------------------------------- Constructor start
@@ -64,18 +64,4 @@ public class CaseInsensitiveLinkedMap<K, V> extends CustomKeyMap<K, V> {
 		super(new LinkedHashMap<>(initialCapacity, loadFactor));
 	}
 	// ------------------------------------------------------------------------- Constructor end
-
-	/**
-	 * 将Key转为小写
-	 *
-	 * @param key KEY
-	 * @return 小写KEY
-	 */
-	@Override
-	protected Object customKey(Object key) {
-		if (key instanceof CharSequence) {
-			key = key.toString().toLowerCase();
-		}
-		return key;
-	}
 }
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveMap.java b/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveMap.java
index 0c892b268..40f805ad0 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveMap.java
@@ -13,7 +13,7 @@ import java.util.Map;
  * @param <V> 值类型
  * @since 3.0.2
  */
-public class CaseInsensitiveMap<K, V> extends CustomKeyMap<K, V> {
+public class CaseInsensitiveMap<K, V> extends FuncKeyMap<K, V> {
 	private static final long serialVersionUID = 4043263744224569870L;
 
 	//------------------------------------------------------------------------- Constructor start
@@ -34,9 +34,10 @@ public class CaseInsensitiveMap<K, V> extends CustomKeyMap<K, V> {
 	}
 
 	/**
-	 * 构造
+	 * 构造<br>
+	 * 注意此构造将传入的Map作为被包装的Map，针对任何修改，传入的Map都会被同样修改。
 	 *
-	 * @param m Map
+	 * @param m 被包装的自定义Map创建器
 	 */
 	public CaseInsensitiveMap(Map<? extends K, ? extends V> m) {
 		this(DEFAULT_LOAD_FACTOR, m);
@@ -61,21 +62,23 @@ public class CaseInsensitiveMap<K, V> extends CustomKeyMap<K, V> {
 	 * @param loadFactor 加载因子
 	 */
 	public CaseInsensitiveMap(int initialCapacity, float loadFactor) {
-		super(new HashMap<>(initialCapacity, loadFactor));
+		this(MapBuilder.create(new HashMap<>(initialCapacity, loadFactor)));
 	}
-	//------------------------------------------------------------------------- Constructor end
 
 	/**
-	 * 将Key转为小写
+	 * 构造<br>
+	 * 注意此构造将传入的Map作为被包装的Map，针对任何修改，传入的Map都会被同样修改。
 	 *
-	 * @param key KEY
-	 * @return 小写KEY
+	 * @param emptyMapBuilder 被包装的自定义Map创建器
 	 */
-	@Override
-	protected Object customKey(Object key) {
-		if (key instanceof CharSequence) {
-			key = key.toString().toLowerCase();
-		}
-		return key;
+	CaseInsensitiveMap(MapBuilder<K, V> emptyMapBuilder) {
+		super(emptyMapBuilder.build(), (key)->{
+			if (key instanceof CharSequence) {
+				key = key.toString().toLowerCase();
+			}
+			//noinspection unchecked
+			return (K) key;
+		});
 	}
+	//------------------------------------------------------------------------- Constructor end
 }
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveTreeMap.java b/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveTreeMap.java
index 7f8b065f6..69f3ec538 100755
--- a/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveTreeMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/CaseInsensitiveTreeMap.java
@@ -15,7 +15,7 @@ import java.util.TreeMap;
  * @param <V> 值类型
  * @since 3.3.1
  */
-public class CaseInsensitiveTreeMap<K, V> extends CustomKeyMap<K, V> {
+public class CaseInsensitiveTreeMap<K, V> extends CaseInsensitiveMap<K, V> {
 	private static final long serialVersionUID = 4043263744224569870L;
 
 	// ------------------------------------------------------------------------- Constructor start
@@ -40,7 +40,7 @@ public class CaseInsensitiveTreeMap<K, V> extends CustomKeyMap<K, V> {
 	/**
 	 * 构造
 	 *
-	 * @param m Map
+	 * @param m Map，初始Map，键值对会被复制到新的TreeMap中
 	 * @since 3.1.2
 	 */
 	public CaseInsensitiveTreeMap(SortedMap<? extends K, ? extends V> m) {
@@ -56,18 +56,4 @@ public class CaseInsensitiveTreeMap<K, V> extends CustomKeyMap<K, V> {
 		super(new TreeMap<>(comparator));
 	}
 	// ------------------------------------------------------------------------- Constructor end
-
-	/**
-	 * 将Key转为小写
-	 *
-	 * @param key KEY
-	 * @return 小写KEY
-	 */
-	@Override
-	protected Object customKey(Object key) {
-		if (key instanceof CharSequence) {
-			key = key.toString().toLowerCase();
-		}
-		return key;
-	}
 }
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/CustomKeyMap.java b/hutool-core/src/main/java/cn/hutool/core/map/CustomKeyMap.java
index 4584943a5..04ed9d371 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/CustomKeyMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/CustomKeyMap.java
@@ -18,11 +18,11 @@ public abstract class CustomKeyMap<K, V> extends MapWrapper<K, V> {
 	 * 构造<br>
 	 * 通过传入一个Map从而确定Map的类型，子类需创建一个空的Map，而非传入一个已有Map，否则值可能会被修改
 	 *
-	 * @param m Map 被包装的Map
+	 * @param emptyMap Map 被包装的Map，必须为空Map，否则自定义key会无效
 	 * @since 3.1.2
 	 */
-	public CustomKeyMap(Map<K, V> m) {
-		super(m);
+	public CustomKeyMap(Map<K, V> emptyMap) {
+		super(emptyMap);
 	}
 
 	@Override
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/FixedLinkedHashMap.java b/hutool-core/src/main/java/cn/hutool/core/map/FixedLinkedHashMap.java
index 1559fde7a..5ddaaa6f9 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/FixedLinkedHashMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/FixedLinkedHashMap.java
@@ -3,7 +3,8 @@ package cn.hutool.core.map;
 import java.util.LinkedHashMap;
 
 /**
- * 固定大小的{@link LinkedHashMap} 实现
+ * 固定大小的{@link LinkedHashMap} 实现<br>
+ * 注意此类非线程安全，由于{@link #get(Object)}操作会修改链表的顺序结构，因此也不可以使用读写锁。
  *
  * @author looly
  *
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/FuncKeyMap.java b/hutool-core/src/main/java/cn/hutool/core/map/FuncKeyMap.java
index e5ca6a719..0cc468d61 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/FuncKeyMap.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/FuncKeyMap.java
@@ -19,13 +19,14 @@ public class FuncKeyMap<K, V> extends CustomKeyMap<K, V> {
 	// ------------------------------------------------------------------------- Constructor start
 
 	/**
-	 * 构造
+	 * 构造<br>
+	 * 注意提供的Map中不能有键值对，否则可能导致自定义key失效
 	 *
-	 * @param m       Map
+	 * @param emptyMap       Map，提供的空map
 	 * @param keyFunc 自定义KEY的函数
 	 */
-	public FuncKeyMap(Map<K, V> m, Function<Object, K> keyFunc) {
-		super(m);
+	public FuncKeyMap(Map<K, V> emptyMap, Function<Object, K> keyFunc) {
+		super(emptyMap);
 		this.keyFunc = keyFunc;
 	}
 	// ------------------------------------------------------------------------- Constructor end
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/MapBuilder.java b/hutool-core/src/main/java/cn/hutool/core/map/MapBuilder.java
index 5840d9204..2f605d71e 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/MapBuilder.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/MapBuilder.java
@@ -13,7 +13,7 @@ import java.util.function.Supplier;
  * @param <V> Value类型
  * @since 3.1.1
  */
-public class MapBuilder<K, V> implements Builder<Map<K,V>> {
+public class MapBuilder<K, V> implements Builder<Map<K, V>> {
 	private static final long serialVersionUID = 1L;
 
 	private final Map<K, V> map;
@@ -120,6 +120,17 @@ public class MapBuilder<K, V> implements Builder<Map<K,V>> {
 		return this;
 	}
 
+	/**
+	 * 清空Map
+	 *
+	 * @return this
+	 * @since 5.7.23
+	 */
+	public MapBuilder<K, V> clear() {
+		this.map.clear();
+		return this;
+	}
+
 	/**
 	 * 创建后的map
 	 *
diff --git a/hutool-core/src/main/java/cn/hutool/core/map/MapWrapper.java b/hutool-core/src/main/java/cn/hutool/core/map/MapWrapper.java
index bfd81dd86..3c1ac5936 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/MapWrapper.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/MapWrapper.java
@@ -88,7 +88,6 @@ public class MapWrapper<K, V> implements Map<K, V>, Iterable<Map.Entry<K, V>>, S
 	}
 
 	@Override
-	@SuppressWarnings("NullableProblems")
 	public void putAll(Map<? extends K, ? extends V> m) {
 		raw.putAll(m);
 	}
@@ -99,25 +98,21 @@ public class MapWrapper<K, V> implements Map<K, V>, Iterable<Map.Entry<K, V>>, S
 	}
 
 	@Override
-	@SuppressWarnings("NullableProblems")
 	public Collection<V> values() {
 		return raw.values();
 	}
 
 	@Override
-	@SuppressWarnings("NullableProblems")
 	public Set<K> keySet() {
 		return raw.keySet();
 	}
 
 	@Override
-	@SuppressWarnings("NullableProblems")
 	public Set<Entry<K, V>> entrySet() {
 		return raw.entrySet();
 	}
 
 	@Override
-	@SuppressWarnings("NullableProblems")
 	public Iterator<Entry<K, V>> iterator() {
 		return this.entrySet().iterator();
 	}
diff --git a/hutool-core/src/test/java/cn/hutool/core/bean/BeanUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/bean/BeanUtilTest.java
index a01dc608b..f31190313 100644
--- a/hutool-core/src/test/java/cn/hutool/core/bean/BeanUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/bean/BeanUtilTest.java
@@ -5,6 +5,7 @@ import cn.hutool.core.bean.copier.CopyOptions;
 import cn.hutool.core.bean.copier.ValueProvider;
 import cn.hutool.core.collection.CollUtil;
 import cn.hutool.core.collection.ListUtil;
+import cn.hutool.core.map.MapBuilder;
 import cn.hutool.core.map.MapUtil;
 import cn.hutool.core.thread.ThreadUtil;
 import cn.hutool.core.util.ArrayUtil;
@@ -78,14 +79,15 @@ public class BeanUtilTest {
 
 	@Test
 	public void fillBeanWithMapIgnoreCaseTest() {
-		HashMap<String, Object> map = MapUtil.newHashMap();
-		map.put("Name", "Joe");
-		map.put("aGe", 12);
-		map.put("openId", "DFDFSDFWERWER");
+		Map<String, Object> map = MapBuilder.<String, Object>create()
+				.put("Name", "Joe")
+				.put("aGe", 12)
+				.put("openId", "DFDFSDFWERWER")
+				.build();
 		SubPerson person = BeanUtil.fillBeanWithMapIgnoreCase(map, new SubPerson(), false);
-		Assert.assertEquals(person.getName(), "Joe");
-		Assert.assertEquals(person.getAge(), 12);
-		Assert.assertEquals(person.getOpenid(), "DFDFSDFWERWER");
+		Assert.assertEquals("Joe", person.getName());
+		Assert.assertEquals(12, person.getAge());
+		Assert.assertEquals("DFDFSDFWERWER", person.getOpenid());
 	}
 
 	@Test