Gender 放到 constant 包中

src/main/java/xyz/zhouxy/plusone/commons/constant/Gender.java

@@ -14,8 +14,9 @@
  * limitations under the License.
  */
 
-package xyz.zhouxy.plusone.commons.model;
+package xyz.zhouxy.plusone.commons.constant;
 
+import xyz.zhouxy.plusone.commons.base.IWithIntCode;
 import xyz.zhouxy.plusone.commons.util.AssertTools;
 
 /**
@@ -23,7 +24,7 @@ import xyz.zhouxy.plusone.commons.util.AssertTools;
  *
  * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
  */
-public enum Gender {
+public enum Gender implements IWithIntCode {
     UNKNOWN(0, "Unknown", "未知"),
     MALE(1, "Male", "男"),
     FEMALE(2, "Female", "女"),
@@ -52,6 +53,11 @@ public enum Gender {
         return value;
     }
 
+    @Override
+    public int getCode() {
+        return value;
+    }
+
     public String getDisplayName() {
         return displayName;
     }

src/main/java/xyz/zhouxy/plusone/commons/model/Chinese2ndGenIDCardNumber.java

@@ -25,10 +25,14 @@ import java.util.regex.Pattern;
 
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableMap;
+import com.google.errorprone.annotations.Immutable;
+
+import xyz.zhouxy.plusone.commons.constant.Gender;
 
 /**
  * 中国第二代居民身份证号
  */
+@Immutable
 public class Chinese2ndGenIDCardNumber extends IDCardNumber {
 
     /** 省份编码 */

src/main/java/xyz/zhouxy/plusone/commons/model/IDCardNumber.java

@@ -23,6 +23,8 @@ import java.util.regex.Pattern;
 
 import javax.annotation.Nonnull;
 
+import xyz.zhouxy.plusone.commons.constant.Gender;
+
 /**
  * 身份证号
  */

src/test/java/xyz/zhouxy/plusone/commons/model/Chinese2ndGenIDCardNumberTests.java

@@ -26,6 +26,7 @@ import java.util.regex.Matcher;
 import org.junit.jupiter.api.Test;
 
 import lombok.extern.slf4j.Slf4j;
+import xyz.zhouxy.plusone.commons.constant.Gender;
 
 @Slf4j
 public class Chinese2ndGenIDCardNumberTests {