diff --git a/day02/src/com/inmind/Demo08.java b/day02/src/com/inmind/Demo08.java
new file mode 100644
index 0000000..268a16d
--- /dev/null
+++ b/day02/src/com/inmind/Demo08.java
@@ -0,0 +1,25 @@
+package com.inmind;
+/*
+9.运算符_赋值运算符
+=
+混合赋值运算
++=,-=,*=,/=,%=
+
+混合赋值运算：先将左边的变量与右边的数值进行对应的运算，将运算结果赋值给左边的变量
+ */
+public class Demo08 {
+    public static void main(String[] args) {
+        //赋值运算符 =
+        int i = 10;
+        //混合赋值运算符
+//        i = i+10;
+        i += 10;
+        System.out.println(i);//20
+
+        i-=5;//i = i-5;
+        System.out.println(i);//15 15 15
+
+        i%=2;//i = i%2
+        System.out.println(i);//1 1 1
+    }
+}