diff --git a/s-day02/src/com/inmind/generic04/Demo08.java b/s-day02/src/com/inmind/generic04/Demo08.java
new file mode 100644
index 0000000..7045233
--- /dev/null
+++ b/s-day02/src/com/inmind/generic04/Demo08.java
@@ -0,0 +1,32 @@
+package com.inmind.generic04;
+
+public class Demo08 {
+    public static void main(String[] args) {
+        //买了手机和平板
+        Phone phone = new Phone();
+        Pad pad = new Pad();
+        phone.call();
+        pad.playApp();
+        /*//手机坏了，平板坏了，找售后工程维修
+        Factory factory = new Factory();
+        //调用工厂的维修方法
+        phone = factory.fixPhone(phone);
+        pad = factory.fixPad(pad);*/
+        //不使用泛型，使用多态的方法
+        /*Factory factory = new Factory<>();
+        Object o = factory.fixObj(phone);
+        Pad o1 = (Pad) o;
+        o1.playApp();*/
+        //使用泛型的方式
+        Factory<Phone> phoneFactory = new Factory<>();
+        Phone fixedPhone = phoneFactory.fix(phone);
+
+        //修平板就找平板工厂
+        Factory<Pad> padFactory = new Factory<>();
+        Pad fixedPad = padFactory.fix(pad);
+
+
+        fixedPhone.call();
+        fixedPad.playApp();
+    }
+}
diff --git a/s-day02/src/com/inmind/generic04/Factory.java b/s-day02/src/com/inmind/generic04/Factory.java
new file mode 100644
index 0000000..03fa36a
--- /dev/null
+++ b/s-day02/src/com/inmind/generic04/Factory.java
@@ -0,0 +1,36 @@
+package com.inmind.generic04;
+/*
+    能不能在一个类中定义一个未知类型,接收的具体的是什么类型,就返回什么类型，这个数据类型要动态，
+    并省略掉强转操作，也避免类型转换异常？？？
+    可以,使用泛型类，在类名加上<任意大写字母>
+
+    泛型类:就是在类中定义了一个未知的类型(动态的类型).
+
+    泛型类的T类型何时确定？
+     创建对象时才确定
+ */
+public class Factory<T> {
+
+    //多态的写法
+    /*public Object fixObj(Object o) {
+        System.out.println("对象已修好");
+        return o;
+    }*/
+
+    //使用T类型
+    public T fix(T t) {
+        System.out.println("对象T已修好");
+        return t;
+    }
+
+    /*//维修手机方法
+    public Phone fixPhone(Phone phone) {
+        System.out.println("手机修好了");
+        return phone;
+    }
+    //维修pad方法
+    public Pad fixPad(Pad pad) {
+        System.out.println("平板修好了");
+        return pad;
+    }*/
+}
diff --git a/s-day02/src/com/inmind/generic04/Pad.java b/s-day02/src/com/inmind/generic04/Pad.java
new file mode 100644
index 0000000..bd1aa60
--- /dev/null
+++ b/s-day02/src/com/inmind/generic04/Pad.java
@@ -0,0 +1,7 @@
+package com.inmind.generic04;
+
+public class Pad {
+    public void playApp(){
+        System.out.println("看抖音");
+    }
+}
diff --git a/s-day02/src/com/inmind/generic04/Phone.java b/s-day02/src/com/inmind/generic04/Phone.java
new file mode 100644
index 0000000..cd0fe94
--- /dev/null
+++ b/s-day02/src/com/inmind/generic04/Phone.java
@@ -0,0 +1,8 @@
+package com.inmind.generic04;
+
+public class Phone {
+
+    public void call() {
+        System.out.println("打电话");
+    }
+}