diff --git a/src/main/java/com/github/hcsp/encapsulation/Cat.java b/src/main/java/com/github/hcsp/encapsulation/Cat.java
index 97eba15..cbb0e0c 100644
--- a/src/main/java/com/github/hcsp/encapsulation/Cat.java
+++ b/src/main/java/com/github/hcsp/encapsulation/Cat.java
@@ -14,11 +14,24 @@ public class Cat {
      *
      * <p>否则，返回一只新创建的猫
      *
-     * @param age 年龄
+     * @param age  年龄
      * @param name 名字
      * @return 创建的猫
      */
-    public static Cat newCat(String name, int age) {}
+    public static Cat newCat(String name, int age) {
+        if ((name == null || name.isEmpty()) || (age <= 0)) {
+
+            return INVALID_CAT;
+
+        }
+
+        return new Cat(name, age);
+    }
+
+    private Cat(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
 
     public String getName() {
         return name;