diff --git a/src/main/java/xyz/zhouxy/plusone/commons/base/IWithCode.java b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithCode.java
index 015fdc3..b8bc1bb 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/base/IWithCode.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithCode.java
@@ -34,4 +34,15 @@ public interface IWithCode<T> {
     default boolean equalsCode(T code) {
         return Objects.equals(getCode(), code);
     }
+    default boolean equalsCode(IWithCode<?> obj) { // TODO 单元测试
+        return obj != null && obj.getCode().equals(getCode());
+    }
+
+    default boolean equalsCode(IWithIntCode obj) { // TODO 单元测试
+        return obj != null && getCode().equals(obj.getCode());
+    }
+
+    default boolean equalsCode(IWithLongCode obj) { // TODO 单元测试
+        return obj != null && getCode().equals(obj.getCode());
+    }
 }
diff --git a/src/main/java/xyz/zhouxy/plusone/commons/base/IWithIntCode.java b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithIntCode.java
index 7deac35..5a5f36c 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/base/IWithIntCode.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithIntCode.java
@@ -29,4 +29,16 @@ public interface IWithIntCode {
     default boolean equalsCode(int code) {
         return getCode() == code;
     }
+
+    default boolean equalsCode(IWithCode<?> obj) { // TODO 单元测试
+        return obj != null && obj.getCode().equals(getCode());
+    }
+
+    default boolean equalsCode(IWithIntCode obj) { // TODO 单元测试
+        return obj != null && getCode() == obj.getCode();
+    }
+
+    default boolean equalsCode(IWithLongCode obj) { // TODO 单元测试
+        return obj != null && getCode() == obj.getCode();
+    }
 }
diff --git a/src/main/java/xyz/zhouxy/plusone/commons/base/IWithLongCode.java b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithLongCode.java
index 1bd8d20..7550358 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/base/IWithLongCode.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithLongCode.java
@@ -29,4 +29,16 @@ public interface IWithLongCode {
     default boolean equalsCode(long code) {
         return getCode() == code;
     }
+
+    default boolean equalsCode(IWithCode<?> obj) { // TODO 单元测试
+        return obj != null && obj.getCode().equals(getCode());
+    }
+
+    default boolean equalsCode(IWithIntCode obj) { // TODO 单元测试
+        return obj != null && getCode() == obj.getCode();
+    }
+
+    default boolean equalsCode(IWithLongCode obj) { // TODO 单元测试
+        return obj != null && getCode() == obj.getCode();
+    }
 }
diff --git a/src/test/java/xyz/zhouxy/plusone/commons/base/IWithCodeTests.java b/src/test/java/xyz/zhouxy/plusone/commons/base/IWithCodeTests.java
new file mode 100644
index 0000000..693d1b6
--- /dev/null
+++ b/src/test/java/xyz/zhouxy/plusone/commons/base/IWithCodeTests.java
@@ -0,0 +1,57 @@
+package xyz.zhouxy.plusone.commons.base;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import javax.annotation.Nonnull;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import xyz.zhouxy.plusone.commons.util.AssertTools;
+
+class IWithCodeTests {
+
+    private static class WithCodeImpl implements IWithCode<String> {
+        @Nonnull
+        private final String code;
+
+        WithCodeImpl(String code) {
+            AssertTools.checkNotNull(code);
+            this.code = code;
+        }
+
+        @Override
+        @Nonnull
+        public String getCode() {
+            return code;
+        }
+    }
+
+    private WithCodeImpl instance;
+
+    @BeforeEach
+    void setUp() {
+        instance = new WithCodeImpl("testCode");
+    }
+
+    @Test
+    void equalsCode_SameCode_ReturnsTrue() {
+        assertTrue(instance.equalsCode("testCode"));
+    }
+
+    @Test
+    void equalsCode_DifferentCode_ReturnsFalse() {
+        assertFalse(instance.equalsCode("wrongCode"));
+    }
+
+    @Test
+    void equalsCode_NullCode_ReturnsFalse() {
+        assertFalse(instance.equalsCode((String) null));
+    }
+
+    @Test
+    void equalsCode_NullObject_ReturnsFalse() {
+        assertFalse(instance.equalsCode((String) null));
+    }
+}
diff --git a/src/test/java/xyz/zhouxy/plusone/commons/base/IWithIntCodeTests.java b/src/test/java/xyz/zhouxy/plusone/commons/base/IWithIntCodeTests.java
new file mode 100644
index 0000000..60fa5ab
--- /dev/null
+++ b/src/test/java/xyz/zhouxy/plusone/commons/base/IWithIntCodeTests.java
@@ -0,0 +1,38 @@
+package xyz.zhouxy.plusone.commons.base;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class IWithIntCodeTests {
+    @Test
+    void test() {
+        IWithIntCode instance1 = new WithIntCodeImpl(10);
+        IWithIntCode instance2 = new WithIntCodeImpl(20);
+        IWithIntCode instance3 = new WithIntCodeImpl(10);
+
+        // Test for equalsCode method
+        assertTrue(instance1.equalsCode(10));
+        assertFalse(instance1.equalsCode(20));
+        assertTrue(instance2.equalsCode(20));
+        assertTrue(instance3.equalsCode(10));
+
+        // Test for distinct instances with same code
+        assertTrue(instance1.equalsCode(instance3.getCode())); // because they have the same code
+        assertFalse(instance1.equalsCode(instance2.getCode())); // because they have different codes
+    }
+}
+
+class WithIntCodeImpl implements IWithIntCode {
+    private int code;
+
+    public WithIntCodeImpl(int code) {
+        this.code = code;
+    }
+
+    @Override
+    public int getCode() {
+        return code;
+    }
+}