diff --git a/s-day02/src/com/inmind/generic_interface04/Demo07.java b/s-day02/src/com/inmind/generic_interface04/Demo07.java
new file mode 100644
index 0000000..43eebcf
--- /dev/null
+++ b/s-day02/src/com/inmind/generic_interface04/Demo07.java
@@ -0,0 +1,13 @@
+package com.inmind.generic_interface04;
+
+public class Demo07 {
+    public static void main(String[] args) {
+        //泛型接口的使用：
+        //1.情况一
+        MyInterfaceImpl impl1 = new MyInterfaceImpl();
+        System.out.println(impl1.method1());
+        //2.情况二
+        MyInterfaceImpl2<Integer> impl2 = new MyInterfaceImpl2<>();
+        Integer i = impl2.method1();
+    }
+}
diff --git a/s-day02/src/com/inmind/generic_interface04/MyInterface.java b/s-day02/src/com/inmind/generic_interface04/MyInterface.java
new file mode 100644
index 0000000..d748124
--- /dev/null
+++ b/s-day02/src/com/inmind/generic_interface04/MyInterface.java
@@ -0,0 +1,18 @@
+package com.inmind.generic_interface04;
+/*
+    泛型接口：在接口中定义一个未知类型
+    泛型接口的格式：
+     public interface 接口名<大写字母>{
+     }
+
+     泛型接口的泛型类型何时确定？？？
+     1.在定义实现子类中直接确定泛型的类型
+     2.在实现子类中不确定类型，在创建实现类对象时才确定类型
+ */
+public interface MyInterface<T> {
+    T method1();
+
+    void method2(T t);
+
+    T method3(T t);
+}
diff --git a/s-day02/src/com/inmind/generic_interface04/MyInterfaceImpl.java b/s-day02/src/com/inmind/generic_interface04/MyInterfaceImpl.java
new file mode 100644
index 0000000..0c9815f
--- /dev/null
+++ b/s-day02/src/com/inmind/generic_interface04/MyInterfaceImpl.java
@@ -0,0 +1,18 @@
+package com.inmind.generic_interface04;
+//情况一：在实现类定义时，直接确认类型
+public class MyInterfaceImpl implements MyInterface<String>{
+    @Override
+    public String method1() {
+        return "";
+    }
+
+    @Override
+    public void method2(String s) {
+
+    }
+
+    @Override
+    public String method3(String s) {
+        return "";
+    }
+}
diff --git a/s-day02/src/com/inmind/generic_interface04/MyInterfaceImpl2.java b/s-day02/src/com/inmind/generic_interface04/MyInterfaceImpl2.java
new file mode 100644
index 0000000..e2acfec
--- /dev/null
+++ b/s-day02/src/com/inmind/generic_interface04/MyInterfaceImpl2.java
@@ -0,0 +1,18 @@
+package com.inmind.generic_interface04;
+//情况二
+public class MyInterfaceImpl2<T> implements MyInterface<T>{
+    @Override
+    public T method1() {
+        return null;
+    }
+
+    @Override
+    public void method2(T t) {
+
+    }
+
+    @Override
+    public T method3(T t) {
+        return null;
+    }
+}