diff --git a/pom.xml b/pom.xml
index bb64491..fb3b5f3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -132,4 +132,29 @@
             </plugins>
         </pluginManagement>
     </build>
+
+    <repositories>
+        <repository>
+            <id>aliyun</id>
+            <url>https://maven.aliyun.com/repository/public</url>
+            <releases>
+                <enabled>true</enabled>
+            </releases>
+            <snapshots>
+                <enabled>false</enabled>
+            </snapshots>
+        </repository>
+    </repositories>
+    <pluginRepositories>
+        <pluginRepository>
+            <id>aliyun-plugin</id>
+            <url>https://maven.aliyun.com/repository/public</url>
+            <releases>
+                <enabled>true</enabled>
+            </releases>
+            <snapshots>
+                <enabled>false</enabled>
+            </snapshots>
+        </pluginRepository>
+    </pluginRepositories>
 </project>
diff --git a/src/main/java/xyz/zhouxy/plusone/commons/annotation/DefinedIn.java b/src/main/java/xyz/zhouxy/plusone/commons/annotation/DefinedIn.java
new file mode 100644
index 0000000..eb21c73
--- /dev/null
+++ b/src/main/java/xyz/zhouxy/plusone/commons/annotation/DefinedIn.java
@@ -0,0 +1,12 @@
+package xyz.zhouxy.plusone.commons.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.SOURCE)
+public @interface DefinedIn {
+    Class<?>[] value();
+}
diff --git a/src/test/java/xyz/zhouxy/plusone/commons/annotation/ExplicitImplTest.java b/src/test/java/xyz/zhouxy/plusone/commons/annotation/ExplicitImplTest.java
new file mode 100644
index 0000000..ab91be7
--- /dev/null
+++ b/src/test/java/xyz/zhouxy/plusone/commons/annotation/ExplicitImplTest.java
@@ -0,0 +1,45 @@
+package xyz.zhouxy.plusone.commons.annotation;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class ExplicitImplTest {
+
+    @Test
+    void test() {
+
+    }
+}
+
+interface A {
+
+    void fooA();
+
+    void fooAll();
+}
+
+interface B {
+
+    void fooB();
+
+    void fooAll();
+}
+
+class C implements A, B {
+
+    @DefinedIn(A.class)
+    @Override
+    public void fooA() {
+    }
+
+    @DefinedIn(B.class)
+    @Override
+    public void fooB() {
+    }
+
+    @DefinedIn({ A.class, B.class })
+    @Override
+    public void fooAll() {
+    }
+}