diff --git a/day09/src/com/inmind/abstract06/Animal.java b/day09/src/com/inmind/abstract06/Animal.java
index dba8450..41de418 100644
--- a/day09/src/com/inmind/abstract06/Animal.java
+++ b/day09/src/com/inmind/abstract06/Animal.java
@@ -2,7 +2,14 @@ package com.inmind.abstract06;
 
 //抽象类
 public abstract class Animal {
+    int i;
+
+    public Animal(){
+        System.out.println("抽象父类Animal的无参构造执行了");
+    }
 
     //抽象方法
     public abstract void eat();
+    public abstract void eat1();
+    public abstract void eat2();
 }
diff --git a/day09/src/com/inmind/abstract06/Demo10.java b/day09/src/com/inmind/abstract06/Demo10.java
index d445062..45a9829 100644
--- a/day09/src/com/inmind/abstract06/Demo10.java
+++ b/day09/src/com/inmind/abstract06/Demo10.java
@@ -7,6 +7,24 @@ package com.inmind.abstract06;
     public abstract class 类名{
         public abstract void 方法名(参数列表);
     }
+----------------------------------------------------------------
+如何使用抽象类和抽象方法???
+1.抽象类不能被创建对象的，只能通过子类创建对象
+2.非抽象的子类，必须实现重写抽象类中的抽象方法
+3.创建子类对象，调用对应方法
+
+注意事项：
+1.抽象类不能创建对象，如果创建，编译无法通过而报错。只能创建其非抽象子类的对象。
+2.抽象类中，可以有构造方法，是供子类创建对象时，初始化父类成员使用的。
+3.抽象类中，不一定包含抽象方法，但是有抽象方法的类必定是抽象类。
+4.抽象类的子类，必须重写抽象父类中所有的抽象方法，否则，编译无法通过而报错。除非该子类也是抽象类。
+
+
+
  */
 public class Demo10 {
+    public static void main(String[] args) {
+        Dog dog = new Dog();
+        dog.eat();
+    }
 }
diff --git a/day09/src/com/inmind/abstract06/Dog.java b/day09/src/com/inmind/abstract06/Dog.java
index e82573e..3a921b4 100644
--- a/day09/src/com/inmind/abstract06/Dog.java
+++ b/day09/src/com/inmind/abstract06/Dog.java
@@ -6,4 +6,14 @@ public class Dog extends Animal{
     public void eat() {
         System.out.println("狗吃骨头");
     }
+
+    @Override
+    public void eat1() {
+
+    }
+
+    @Override
+    public void eat2() {
+
+    }
 }
diff --git a/day09/src/com/inmind/abstract_test07/Demo11.java b/day09/src/com/inmind/abstract_test07/Demo11.java
new file mode 100644
index 0000000..26ea505
--- /dev/null
+++ b/day09/src/com/inmind/abstract_test07/Demo11.java
@@ -0,0 +1,12 @@
+package com.inmind.abstract_test07;
+/*
+简单练习：定义一个图形类，求周长和面积，但是有不知道如何实现，只能由具体的图形子类(长方形，圆形)实现
+ */
+public class Demo11 {
+    public static void main(String[] args) {
+        //创建一个长方形，求面积和周长
+        Rectangle rectangle = new Rectangle(4, 3);
+        System.out.println("长方形面积为："+rectangle.getArea());
+        System.out.println("长方形周长为："+rectangle.getZC());
+    }
+}
diff --git a/day09/src/com/inmind/abstract_test07/Rectangle.java b/day09/src/com/inmind/abstract_test07/Rectangle.java
new file mode 100644
index 0000000..1d4beb0
--- /dev/null
+++ b/day09/src/com/inmind/abstract_test07/Rectangle.java
@@ -0,0 +1,20 @@
+package com.inmind.abstract_test07;
+//长方形类
+public  class Rectangle extends Shape{
+
+    //在创建长方形对象，必须传入2个属性：长和宽
+    public Rectangle(int chang ,int kuan){
+        super(chang,kuan,0);
+    }
+
+
+    @Override
+    public int getArea() {
+        return getChang()*getKuan();
+    }
+
+    @Override
+    public int getZC() {
+        return 2*(getChang()+getKuan());
+    }
+}
diff --git a/day09/src/com/inmind/abstract_test07/Shape.java b/day09/src/com/inmind/abstract_test07/Shape.java
new file mode 100644
index 0000000..4366faa
--- /dev/null
+++ b/day09/src/com/inmind/abstract_test07/Shape.java
@@ -0,0 +1,46 @@
+package com.inmind.abstract_test07;
+//图形类：定义一些功能和属性
+public abstract class Shape {
+    //至少需要长，宽，半径
+    private int chang;
+    private int kuan;
+    private int r;
+    //定义构造方法
+    public Shape() {
+    }
+
+    public Shape(int chang, int kuan, int r) {
+        this.chang = chang;
+        this.kuan = kuan;
+        this.r = r;
+    }
+
+    //设置get/set方法，访问私有属性
+    public int getChang() {
+        return chang;
+    }
+
+    public void setChang(int chang) {
+        this.chang = chang;
+    }
+
+    public int getKuan() {
+        return kuan;
+    }
+
+    public void setKuan(int kuan) {
+        this.kuan = kuan;
+    }
+
+    public int getR() {
+        return r;
+    }
+
+    public void setR(int r) {
+        this.r = r;
+    }
+
+    //求周长和面积
+    public abstract int getArea();
+    public abstract int getZC();
+}