diff --git a/day02/src/com/inmind/yunsuanfu02/Demo06.java b/day02/src/com/inmind/yunsuanfu02/Demo06.java
new file mode 100644
index 0000000..435bad4
--- /dev/null
+++ b/day02/src/com/inmind/yunsuanfu02/Demo06.java
@@ -0,0 +1,24 @@
+package com.inmind.yunsuanfu02;
+/*
+运算符_算术运算符_字符串连接
+
++ 符号在遇到字符串的时候，表示连接、拼接的含义。
+
+当数字与字符串进行使用+来进行运算时，进行了拼接操作，拼接成一个更长的字符串
+*/
+public class Demo06 {
+    public static void main(String[] args) {
+        //定义一个字符串
+        String str = "abc";
+        String str1 = "123";
+        System.out.println(str);
+        System.out.println(str1);
+        System.out.println(str+str1);
+        //数字与字符串进行加法运算
+        System.out.println("abc"+123);//abc123
+        System.out.println(123+"abc"+123);//123abc123
+        System.out.println(1+2+"abc");//3abc
+        System.out.println(1+2+"abc"+3+4);//3abc34
+
+    }
+}
diff --git a/day02/src/com/inmind/yunsuanfu02/Demo07.java b/day02/src/com/inmind/yunsuanfu02/Demo07.java
new file mode 100644
index 0000000..90c326b
--- /dev/null
+++ b/day02/src/com/inmind/yunsuanfu02/Demo07.java
@@ -0,0 +1,4 @@
+package com.inmind.yunsuanfu02;
+
+public class Demo07 {
+}