diff --git a/hutool-json/src/main/java/org/dromara/hutool/json/serializer/JSONMapper.java b/hutool-json/src/main/java/org/dromara/hutool/json/serializer/JSONMapper.java
index 4e15b4d47..68b727d02 100644
--- a/hutool-json/src/main/java/org/dromara/hutool/json/serializer/JSONMapper.java
+++ b/hutool-json/src/main/java/org/dromara/hutool/json/serializer/JSONMapper.java
@@ -201,6 +201,7 @@ public class JSONMapper implements Serializable {
 	 *   <li>standard property (Double, String, et al) =》 原对象</li>
 	 *   <li>其它 =》 尝试包装为JSONObject，否则返回{@code null}</li>
 	 * </ul>
+	 * 注意，此方法不支持JSON字符串的解析，解析请用{@link #map(CharSequence)}
 	 *
 	 * @param obj 被映射的对象
 	 * @return 映射后的值，null表示此值需被忽略
@@ -249,11 +250,11 @@ public class JSONMapper implements Serializable {
 	 * </ul>
 	 *
 	 * @param obj  被映射的对象
-	 * @param json 被映射的到的对象，{@code null}表示自动识别
+	 * @param json 被映射的到的对象，{@code null}表示根据序列化器自动识别
 	 * @param <T>  JSON类型
 	 * @return 映射后的值，null表示此值需被忽略
 	 */
-	@SuppressWarnings({"ReassignedVariable", "unchecked"})
+	@SuppressWarnings({"unchecked"})
 	private <T extends JSON> T mapTo(Object obj, final T json) {
 		if (null == obj) {
 			return null;
diff --git a/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/IterTypeAdapter.java b/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/IterTypeAdapter.java
index a919e27ba..06a50e48b 100644
--- a/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/IterTypeAdapter.java
+++ b/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/IterTypeAdapter.java
@@ -81,24 +81,6 @@ public class IterTypeAdapter implements MatcherJSONSerializer<Object>, MatcherJS
 		return deserialize(json, collectionClass, elementType);
 	}
 
-	/**
-	 * 从Iterator中读取数据，并添加到JSONArray中
-	 *
-	 * @param source    源对象，用于检查循环引用
-	 * @param iter      {@link Iterator}
-	 * @param jsonArray {@link JSONArray}
-	 */
-	public void mapFromIterator(final Object source, final Iterator<?> iter, final JSONArray jsonArray) {
-		Object next;
-		while (iter.hasNext()) {
-			next = iter.next();
-			// 检查循环引用
-			if (next != source) {
-				jsonArray.addObj(next);
-			}
-		}
-	}
-
 	/**
 	 * 反序列化
 	 *
@@ -119,6 +101,24 @@ public class IterTypeAdapter implements MatcherJSONSerializer<Object>, MatcherJS
 		return result;
 	}
 
+	/**
+	 * 从Iterator中读取数据，并添加到JSONArray中
+	 *
+	 * @param source    源对象，用于检查循环引用
+	 * @param iter      {@link Iterator}
+	 * @param jsonArray {@link JSONArray}
+	 */
+	static void mapFromIterator(final Object source, final Iterator<?> iter, final JSONArray jsonArray) {
+		Object next;
+		while (iter.hasNext()) {
+			next = iter.next();
+			// 检查循环引用
+			if (next != source) {
+				jsonArray.addObj(next);
+			}
+		}
+	}
+
 	/**
 	 * 将JSONObject转换为集合
 	 *
@@ -126,7 +126,7 @@ public class IterTypeAdapter implements MatcherJSONSerializer<Object>, MatcherJS
 	 * @param result      结果集合
 	 * @param elementType 元素类型
 	 */
-	private void fill(final JSONObject json, final Collection<?> result, final Type elementType) {
+	private static void fill(final JSONObject json, final Collection<?> result, final Type elementType) {
 		json.forEach((key, value)->{
 			result.add(null == value ? null : value.toBean(elementType));
 		});
@@ -139,7 +139,7 @@ public class IterTypeAdapter implements MatcherJSONSerializer<Object>, MatcherJS
 	 * @param result      结果集合
 	 * @param elementType 元素类型
 	 */
-	private void fill(final JSONArray json, final Collection<?> result, final Type elementType) {
+	private static void fill(final JSONArray json, final Collection<?> result, final Type elementType) {
 		json.forEach((element)->{
 			result.add(null == element ? null : element.toBean(elementType));
 		});
diff --git a/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/MapTypeAdapter.java b/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/MapTypeAdapter.java
index f5401f9d5..153e3078a 100644
--- a/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/MapTypeAdapter.java
+++ b/hutool-json/src/main/java/org/dromara/hutool/json/serializer/impl/MapTypeAdapter.java
@@ -74,7 +74,7 @@ public class MapTypeAdapter implements MatcherJSONSerializer<Map<?, ?>>, Matcher
 			} else{
 				iter = bean.entrySet().iterator();
 			}
-			IterTypeAdapter.INSTANCE.mapFromIterator(bean, iter, (JSONArray) contextJson);
+			IterTypeAdapter.mapFromIterator(bean, iter, (JSONArray) contextJson);
 			return contextJson;
 		}