diff --git a/day03/src/com/inmind/for03/Demo05.java b/day03/src/com/inmind/for03/Demo05.java
new file mode 100644
index 0000000..aa51c86
--- /dev/null
+++ b/day03/src/com/inmind/for03/Demo05.java
@@ -0,0 +1,47 @@
+package com.inmind.for03;
+/*
+for , while ,do-while 循环
+循环三要素：循环变量初始化、循环条件、修改循环变量
+
+for循环的格式：
+for(循环变量初始化①;循环条件②;修改循环变量④){
+        循环语句③
+}
+
+执行顺序：①②③④>②③④>②③④…②不满足为止。
+
+*/
+public class Demo05 {
+    public static void main(String[] args) {
+        //打印1~10的值
+        for(int i = 1;i<=10;i++){
+            System.out.println(i);
+        }
+        System.out.println("程序结束");
+        System.out.println("-----------------------");
+        //打印10~1的值
+        for(int j = 10;j>=1;j--){
+            System.out.println(j);
+        }
+
+        System.out.println("-----------------------");
+        //打印a~z的值字符  a = 97   z = 122
+        for(int i = 97; i <=122;i++){
+            System.out.println((char) i);
+        }
+        System.out.println("-----------------------");
+        for (char i = 'a'; i <= 'z'; i++) {
+            System.out.println(i);
+        }
+        System.out.println("-----------------------");
+        for (char i = 'z'; i >= 'a'; i--) {
+            System.out.println(i);
+        }
+        System.out.println("-----------------------");
+
+        //打印100次"hello world"
+        for (int i = 1; i <= 100; i++) {
+            System.out.println("helloworld");
+        }
+    }
+}