diff --git a/day03/src/com/inmind/while04/Demo07.java b/day03/src/com/inmind/while04/Demo07.java
new file mode 100644
index 0000000..2559936
--- /dev/null
+++ b/day03/src/com/inmind/while04/Demo07.java
@@ -0,0 +1,37 @@
+package com.inmind.while04;
+/*
+循环三要素：循环变量初始化、循环条件、修改循环变量
+
+循环变量初始化①
+  while(循环条件②){
+    循环体③
+    修改循环变量④
+}
+
+顺序：①②③④>②③④>②③④…②不满足为止。
+*/
+public class Demo07 {
+    public static void main(String[] args) {
+        //打印1~10
+       int i = 1;
+        while(i<=10){
+            System.out.println(i);
+            i++;
+        }
+        System.out.println("------------------");
+        //打印10~1
+        int j = 10;
+        while (j >= 1) {
+            System.out.println(j);
+            j--;
+        }
+        System.out.println("----------------");
+        //打印A~Z
+        char c = 'A';
+        while (c <= 'Z') {
+            System.out.println(c);
+            c++;
+        }
+        System.out.println("程序结束");
+    }
+}