diff --git a/javaSE-day07/src/com/inmind/functional_interface02/Demo05.java b/javaSE-day07/src/com/inmind/functional_interface02/Demo05.java
new file mode 100644
index 0000000..a691a84
--- /dev/null
+++ b/javaSE-day07/src/com/inmind/functional_interface02/Demo05.java
@@ -0,0 +1,30 @@
+package com.inmind.functional_interface02;
+
+import java.util.function.Consumer;
+
+/*
+ 在jdk1.8之后,java提供了一些常用的函数式接口供开发人员直接使用.
+    9.常用的函数式接口_Consumer
+    Interface Consumer<T>
+    抽象方法:
+    void accept(T t) 对给定的参数执行此操作。
+
+    注意:
+        1.Consumer表示一个消费者.只接受一个参数,没有返回值.
+        2.什么时候要使用Consumer接口??
+          当我们开发人员想自定义一个函数式接口,并且该接口中要定义一个接收一个参数,没有返回值的方法
+
+    需求:定义出一个使用常用函数式接口的方法,并对字符串进行消费操作(大写打印,小写打印)
+ */
+public class Demo05 {
+    public static void main(String[] args) {
+//        print((String s)->{System.out.println(s.toLowerCase());},"aBcD");
+        print(s->System.out.println(s.toLowerCase()),"aBcD");
+    }
+
+    //定义出一个使用常用函数式接口的方法
+    public static void print(Consumer<String> consumer,String str) {
+        consumer.accept(str);
+    }
+
+}
diff --git a/javaSE-day07/src/com/inmind/functional_interface02/MyInterface1.java b/javaSE-day07/src/com/inmind/functional_interface02/MyInterface1.java
new file mode 100644
index 0000000..5180cf2
--- /dev/null
+++ b/javaSE-day07/src/com/inmind/functional_interface02/MyInterface1.java
@@ -0,0 +1,6 @@
+package com.inmind.functional_interface02;
+
+@FunctionalInterface
+public interface MyInterface1 {
+    void method1(int i);
+}
diff --git a/javaSE-day07/src/com/inmind/functional_interface02/MyInterface2.java b/javaSE-day07/src/com/inmind/functional_interface02/MyInterface2.java
new file mode 100644
index 0000000..24e4b92
--- /dev/null
+++ b/javaSE-day07/src/com/inmind/functional_interface02/MyInterface2.java
@@ -0,0 +1,6 @@
+package com.inmind.functional_interface02;
+
+@FunctionalInterface
+public interface MyInterface2 {
+    void method2(int a);
+}
diff --git a/javaSE-day07/src/com/inmind/functional_interface02/MyInterface3.java b/javaSE-day07/src/com/inmind/functional_interface02/MyInterface3.java
new file mode 100644
index 0000000..ee6e65f
--- /dev/null
+++ b/javaSE-day07/src/com/inmind/functional_interface02/MyInterface3.java
@@ -0,0 +1,6 @@
+package com.inmind.functional_interface02;
+
+@FunctionalInterface
+public interface MyInterface3 {
+    void method3(int c);
+}