diff --git a/day01/src/com/inmind/Demo01.java b/day01/src/com/inmind/Demo01.java
new file mode 100644
index 0000000..2eb4a36
--- /dev/null
+++ b/day01/src/com/inmind/Demo01.java
@@ -0,0 +1,16 @@
+package com.inmind;
+
+public class Demo01 {
+    public static void main(String[] args){
+        //输出整数常量
+        System.out.println(123);
+        //输出小数常量
+        System.out.println(0.125);
+        //输出字符常量
+        System.out.println('A');
+        //输出布尔常量
+        System.out.println(true);
+        //输出字符串常量
+        System.out.println("你好Java");
+    }
+}
diff --git a/day01/src/com/inmind/HelloWorld.java b/day01/src/com/inmind/HelloWorld.java
index 4e7cf1f..c190ada 100644
--- a/day01/src/com/inmind/HelloWorld.java
+++ b/day01/src/com/inmind/HelloWorld.java
@@ -1,6 +1,10 @@
 package com.inmind;
-
+//ctlr+/
+//当前是一个java入门程序
 public class HelloWorld {
+    //ctrl+shift+/
+    /*这是一个主程序
+    java程序运行的主入口*/
     public static void main(String[] args) {
         System.out.println("你好，同学们");
         System.out.println("你好，同学们版本1");