diff --git a/src/main/java/com/github/hcsp/inheritance/Cat.java b/src/main/java/com/github/hcsp/inheritance/Cat.java
index f86dc38..7a50e63 100644
--- a/src/main/java/com/github/hcsp/inheritance/Cat.java
+++ b/src/main/java/com/github/hcsp/inheritance/Cat.java
@@ -1,17 +1,15 @@
 package com.github.hcsp.inheritance;
 
-public class Cat {
+public class Cat extends Animal{
+
     private String name;
 
     public Cat(String name) {
+        super(name);
         this.name = name;
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
-
     public void meow() {
-        System.out.println("喵" + name);
+        super.call("喵" );
     }
 }
diff --git a/src/main/java/com/github/hcsp/inheritance/Dog.java b/src/main/java/com/github/hcsp/inheritance/Dog.java
index 24e713a..282f907 100644
--- a/src/main/java/com/github/hcsp/inheritance/Dog.java
+++ b/src/main/java/com/github/hcsp/inheritance/Dog.java
@@ -1,17 +1,15 @@
 package com.github.hcsp.inheritance;
 
-public class Dog {
+public class Dog extends Animal {
     private String name;
 
     public Dog(String name) {
+        super(name);
         this.name = name;
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
 
     public void wang() {
-        System.out.println("汪" + name);
+        super.call("汪");
     }
 }
diff --git a/src/main/java/com/github/hcsp/inheritance/Rat.java b/src/main/java/com/github/hcsp/inheritance/Rat.java
index bc517d1..50da430 100644
--- a/src/main/java/com/github/hcsp/inheritance/Rat.java
+++ b/src/main/java/com/github/hcsp/inheritance/Rat.java
@@ -1,17 +1,16 @@
 package com.github.hcsp.inheritance;
 
-public class Rat {
+public class Rat extends Animal {
     private String name;
 
     public Rat(String name) {
+        super(name);
         this.name = name;
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
 
     public void zhizhi() {
-        System.out.println("吱吱" + name);
+        super.call("吱吱");
     }
+
 }