diff --git a/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java b/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java
index f8da6dc..23996f8 100644
--- a/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java
+++ b/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java
@@ -21,66 +21,68 @@ import xyz.zhouxy.plusone.validator.map.MapValidator;
 public //
 class MapValidatorTests {
 
-    private static final String USERNAME = "username";
-    private static final String ACCOUNT = "account";
-    private static final String PASSWORD = "password";
-    private static final String PASSWORD2 = "password2";
-    private static final String AGE = "age";
-    private static final String BOOLEAN = "boolean";
-    private static final String ROLE_LIST = "roleList";
-
-    private static final MapValidator<String, Object> validator = new MapValidator<String, Object>(
-            new String[] { USERNAME, ACCOUNT, PASSWORD, AGE, BOOLEAN, ROLE_LIST }) {
-        {
-
-            checkValue(USERNAME, String.class).withRule(
-                    PredicateTools.from(StringUtils::isNotBlank)
-                            .and(username -> RegexTools.matches(username, PatternConsts.USERNAME)),
-                    username -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", username)));
-
-            checkValue(ACCOUNT, String.class).withRule(
-                    PredicateTools.from(StringUtils::isNotBlank)
-                            .and(account -> RegexTools.matchesOne(account,
-                                    new Pattern[] { PatternConsts.EMAIL, PatternConsts.MOBILE_PHONE })),
-                    "请输入正确的邮箱地址或手机号");
-
-            checkValue(PASSWORD, String.class)
-                    .withRule(StringUtils::isNotEmpty, "密码不能为空")
-                    .withRule(pwd -> RegexTools.matches(pwd, PatternConsts.PASSWORD), "密码不符合规范");
-
-            // 校验到多个属性，只能针对 map 本身进行校验
-            withRule(m -> Objects.equals(m.get(PASSWORD), m.get(PASSWORD2)),
-                    "两次输入的密码不一样！");
-
-            // 通过泛型方式调用方法，指定数据类型
-            this.<Integer>checkValue(AGE)
-                    .withRule(Objects::nonNull)
-                    .withRule(age -> (18 <= age && 60 >= age));
-
-            checkValue(BOOLEAN, Boolean.class)
-                    .withRule(Objects::nonNull, "Boolean property could not be null.")
-                    .withRule(b -> b, "Boolean property must be true.");
-
-            this.<Collection<String>>checkValue(ROLE_LIST)
-                    .withRule(CollectionTools::isNotEmpty, "角色列表不能为空！")
-                    .withRule(l -> l.stream().allMatch(StringUtils::isNotBlank),
-                            () -> new IllegalArgumentException("角色标识不能为空！"));
-
-        }
-    };
+    private static final MapValidator<String, Object> validator = ParamsValidator.INSTANCE;
 
     @Test
     void testValidateAndCopy() {
         Map<String, Object> params = new HashMap<>();
-        params.put("username", "ZhouXY");
-        params.put("account", "zhouxy@code108.cn");
-        params.put("password", "99Code108");
-        params.put("password2", "99Code108");
-        params.put("age", 18);
-        params.put("boolean", true);
-        params.put("roleList", Arrays.asList("admin", ""));
+        params.put(ParamsValidator.USERNAME, "ZhouXY");
+        params.put(ParamsValidator.ACCOUNT, "zhouxy@code108.cn");
+        params.put(ParamsValidator.PASSWORD, "99Code108");
+        params.put(ParamsValidator.PASSWORD2, "99Code108");
+        params.put(ParamsValidator.AGE, 18);
+        params.put(ParamsValidator.BOOLEAN, true);
+        params.put(ParamsValidator.ROLE_LIST, Arrays.asList("admin", ""));
 
         Map<String, Object> validedParams = validator.validateAndCopy(params);
         System.out.println(validedParams);
     }
 }
+
+class ParamsValidator extends MapValidator<String, Object> {
+    public static final String USERNAME = "username";
+    public static final String ACCOUNT = "account";
+    public static final String PASSWORD = "password";
+    public static final String PASSWORD2 = "password2";
+    public static final String AGE = "age";
+    public static final String BOOLEAN = "boolean";
+    public static final String ROLE_LIST = "roleList";
+
+    public static final ParamsValidator INSTANCE = new ParamsValidator();
+
+    private ParamsValidator() {
+        super(new String[] { USERNAME, ACCOUNT, PASSWORD, AGE, BOOLEAN, ROLE_LIST });
+        checkValue(USERNAME, String.class).withRule(
+                PredicateTools.from(StringUtils::isNotBlank)
+                        .and(username -> RegexTools.matches(username, PatternConsts.USERNAME)),
+                username -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", username)));
+
+        checkValue(ACCOUNT, String.class).withRule(
+                PredicateTools.from(StringUtils::isNotBlank)
+                        .and(account -> RegexTools.matchesOne(account,
+                                new Pattern[] { PatternConsts.EMAIL, PatternConsts.MOBILE_PHONE })),
+                "请输入正确的邮箱地址或手机号");
+
+        checkValue(PASSWORD, String.class)
+                .withRule(StringUtils::isNotEmpty, "密码不能为空")
+                .withRule(pwd -> RegexTools.matches(pwd, PatternConsts.PASSWORD), "密码不符合规范");
+
+        // 校验到多个属性，只能针对 map 本身进行校验
+        withRule(m -> Objects.equals(m.get(PASSWORD), m.get(PASSWORD2)),
+                "两次输入的密码不一样！");
+
+        // 通过泛型方式调用方法，指定数据类型
+        this.<Integer>checkValue(AGE)
+                .withRule(Objects::nonNull)
+                .withRule(age -> (18 <= age && 60 >= age));
+
+        checkValue(BOOLEAN, Boolean.class)
+                .withRule(Objects::nonNull, "Boolean property could not be null.")
+                .withRule(b -> b, "Boolean property must be true.");
+
+        this.<Collection<String>>checkValue(ROLE_LIST)
+                .withRule(CollectionTools::isNotEmpty, "角色列表不能为空！")
+                .withRule(l -> l.stream().allMatch(StringUtils::isNotBlank),
+                        () -> new IllegalArgumentException("角色标识不能为空！"));
+    }
+}