diff --git a/src/main/java/com/github/hcsp/inheritance/Animal.java b/src/main/java/com/github/hcsp/inheritance/Animal.java
new file mode 100644
index 0000000..0690b06
--- /dev/null
+++ b/src/main/java/com/github/hcsp/inheritance/Animal.java
@@ -0,0 +1,9 @@
+package com.github.hcsp.inheritance;
+
+public class Animal {
+    protected String name;
+
+    public void sayMyName() {
+        System.out.println("我的名字是" + name);
+    }
+}
diff --git a/src/main/java/com/github/hcsp/inheritance/Cat.java b/src/main/java/com/github/hcsp/inheritance/Cat.java
index f86dc38..cb5212c 100644
--- a/src/main/java/com/github/hcsp/inheritance/Cat.java
+++ b/src/main/java/com/github/hcsp/inheritance/Cat.java
@@ -1,16 +1,11 @@
 package com.github.hcsp.inheritance;
 
-public class Cat {
-    private String name;
+public class Cat extends Animal{
 
     public Cat(String name) {
         this.name = name;
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
-
     public void meow() {
         System.out.println("喵" + name);
     }
diff --git a/src/main/java/com/github/hcsp/inheritance/Dog.java b/src/main/java/com/github/hcsp/inheritance/Dog.java
index 24e713a..81d3979 100644
--- a/src/main/java/com/github/hcsp/inheritance/Dog.java
+++ b/src/main/java/com/github/hcsp/inheritance/Dog.java
@@ -1,16 +1,11 @@
 package com.github.hcsp.inheritance;
 
-public class Dog {
-    private String name;
+public class Dog extends Animal{
 
     public Dog(String name) {
         this.name = name;
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
-
     public void wang() {
         System.out.println("汪" + name);
     }
diff --git a/src/main/java/com/github/hcsp/inheritance/Rat.java b/src/main/java/com/github/hcsp/inheritance/Rat.java
index bc517d1..d5615b1 100644
--- a/src/main/java/com/github/hcsp/inheritance/Rat.java
+++ b/src/main/java/com/github/hcsp/inheritance/Rat.java
@@ -1,14 +1,9 @@
 package com.github.hcsp.inheritance;
 
-public class Rat {
-    private String name;
+public class Rat extends Animal{
 
     public Rat(String name) {
-        this.name = name;
-    }
-
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
+        super.name = name;
     }
 
     public void zhizhi() {