diff --git a/hutool-core/src/main/java/cn/hutool/core/io/LineHandler.java b/hutool-core/src/main/java/cn/hutool/core/io/LineHandler.java
index 361021908..cfd5cff8c 100644
--- a/hutool-core/src/main/java/cn/hutool/core/io/LineHandler.java
+++ b/hutool-core/src/main/java/cn/hutool/core/io/LineHandler.java
@@ -5,6 +5,7 @@ package cn.hutool.core.io;
  * @author Looly
  *
  */
+@FunctionalInterface
 public interface LineHandler {
 	/**
 	 * 处理一行数据，可以编辑后存入指定地方
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/Editor.java b/hutool-core/src/main/java/cn/hutool/core/lang/Editor.java
index 96090703f..bc7ac3f0f 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/Editor.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/Editor.java
@@ -12,6 +12,7 @@ package cn.hutool.core.lang;
  * @param <T> 被编辑对象类型
  * @author Looly
  */
+@FunctionalInterface
 public interface Editor<T> {
 	/**
 	 * 修改过滤后的结果
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/Filter.java b/hutool-core/src/main/java/cn/hutool/core/lang/Filter.java
index 8a7266236..0443da1e2 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/Filter.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/Filter.java
@@ -5,6 +5,7 @@ package cn.hutool.core.lang;
  * @author Looly
  *
  */
+@FunctionalInterface
 public interface Filter<T> {
 	/**
 	 * 是否接受对象
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/Matcher.java b/hutool-core/src/main/java/cn/hutool/core/lang/Matcher.java
index a74b65d5e..c5c7f956a 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/Matcher.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/Matcher.java
@@ -6,6 +6,7 @@ package cn.hutool.core.lang;
  *
  * @param <T> 匹配的对象类型
  */
+@FunctionalInterface
 public interface Matcher<T>{
 	/**
 	 * 给定对象是否匹配
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/Replacer.java b/hutool-core/src/main/java/cn/hutool/core/lang/Replacer.java
index e086d08c9..26cbfe76c 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/Replacer.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/Replacer.java
@@ -9,6 +9,7 @@ package cn.hutool.core.lang;
  * @param <T> 被替换操作的类型
  * @since 4.1.5
  */
+@FunctionalInterface
 public interface Replacer<T> {
 	
 	/**
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/copier/Copier.java b/hutool-core/src/main/java/cn/hutool/core/lang/copier/Copier.java
index 6ba734f5e..35fa27562 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/copier/Copier.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/copier/Copier.java
@@ -6,6 +6,7 @@ package cn.hutool.core.lang.copier;
  *
  * @param <T> 拷贝目标类型
  */
+@FunctionalInterface
 public interface Copier<T> {
 	/**
 	 * 执行拷贝
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/func/Func.java b/hutool-core/src/main/java/cn/hutool/core/lang/func/Func.java
index 595601961..8a91da6f1 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/func/Func.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/func/Func.java
@@ -12,6 +12,7 @@ package cn.hutool.core.lang.func;
  * @param <R> 返回值类型
  * @since 3.1.0
  */
+@FunctionalInterface
 public interface Func<P, R> {
 	/**
 	 * 执行函数
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/func/Func0.java b/hutool-core/src/main/java/cn/hutool/core/lang/func/Func0.java
index f920c7402..c0cbe71d8 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/func/Func0.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/func/Func0.java
@@ -11,6 +11,7 @@ package cn.hutool.core.lang.func;
  * @param <R> 返回值类型
  * @since 4.5.2
  */
+@FunctionalInterface
 public interface Func0<R> {
 	/**
 	 * 执行函数
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/func/Func1.java b/hutool-core/src/main/java/cn/hutool/core/lang/func/Func1.java
index 5701e9030..3306e82fd 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/func/Func1.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/func/Func1.java
@@ -12,6 +12,7 @@ package cn.hutool.core.lang.func;
  * @param <R> 返回值类型
  * @since 4.2.2
  */
+@FunctionalInterface
 public interface Func1<P, R> {
 	
 	/**
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc.java b/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc.java
index fb75fe15c..4034b79ff 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc.java
@@ -11,6 +11,7 @@ package cn.hutool.core.lang.func;
  * @param <P> 参数类型
  * @since 3.1.0
  */
+@FunctionalInterface
 public interface VoidFunc<P> {
 	
 	/**
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc0.java b/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc0.java
index b8a1cbb99..fd80af43b 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc0.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc0.java
@@ -10,6 +10,7 @@ package cn.hutool.core.lang.func;
  *
  * @since 3.2.3
  */
+@FunctionalInterface
 public interface VoidFunc0 {
 
 	/**
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc1.java b/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc1.java
index 922a699db..ac32f634b 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc1.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/func/VoidFunc1.java
@@ -10,6 +10,7 @@ package cn.hutool.core.lang.func;
  *
  * @since 3.2.3
  */
+@FunctionalInterface
 public interface VoidFunc1<P> {
 	
 	/**
diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/loader/Loader.java b/hutool-core/src/main/java/cn/hutool/core/lang/loader/Loader.java
index 02c06611e..d1f22b1d5 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/loader/Loader.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/loader/Loader.java
@@ -8,6 +8,7 @@ package cn.hutool.core.lang.loader;
  *
  * @param <T> 对象类型
  */
+@FunctionalInterface
 public interface Loader<T> {
 
 	/**
diff --git a/hutool-poi/src/main/java/cn/hutool/poi/excel/sax/handler/RowHandler.java b/hutool-poi/src/main/java/cn/hutool/poi/excel/sax/handler/RowHandler.java
index 3c6ad3346..f76f534e7 100644
--- a/hutool-poi/src/main/java/cn/hutool/poi/excel/sax/handler/RowHandler.java
+++ b/hutool-poi/src/main/java/cn/hutool/poi/excel/sax/handler/RowHandler.java
@@ -7,6 +7,7 @@ import java.util.List;
  * @author looly
  *
  */
+@FunctionalInterface
 public interface RowHandler {
 	
 	/**