diff --git a/day09/src/com/inmind/abstract07/Animal.java b/day09/src/com/inmind/abstract07/Animal.java
new file mode 100644
index 0000000..017600c
--- /dev/null
+++ b/day09/src/com/inmind/abstract07/Animal.java
@@ -0,0 +1,8 @@
+package com.inmind.abstract07;
+
+//抽象类
+public abstract class Animal {
+
+    //所有动物都必须实现的行为（吃）
+    public abstract void eat();//抽象方法：没有方法体的方法
+}
diff --git a/day09/src/com/inmind/abstract07/Cat.java b/day09/src/com/inmind/abstract07/Cat.java
new file mode 100644
index 0000000..ced32ee
--- /dev/null
+++ b/day09/src/com/inmind/abstract07/Cat.java
@@ -0,0 +1,9 @@
+package com.inmind.abstract07;
+
+public  class Cat extends Animal{
+
+    @Override
+    public void eat() {
+        System.out.println("猫吃鱼");
+    }
+}
diff --git a/day09/src/com/inmind/abstract07/Demo07.java b/day09/src/com/inmind/abstract07/Demo07.java
new file mode 100644
index 0000000..7513e20
--- /dev/null
+++ b/day09/src/com/inmind/abstract07/Demo07.java
@@ -0,0 +1,4 @@
+package com.inmind.abstract07;
+
+public class Demo07 {
+}
diff --git a/day09/src/com/inmind/abstract07/Dog.java b/day09/src/com/inmind/abstract07/Dog.java
new file mode 100644
index 0000000..7f4e3e9
--- /dev/null
+++ b/day09/src/com/inmind/abstract07/Dog.java
@@ -0,0 +1,8 @@
+package com.inmind.abstract07;
+
+public class Dog extends Animal{
+    @Override
+    public void eat() {
+        System.out.println("狗吃骨头");
+    }
+}