diff --git a/day03/src/com/inmind/circle06/Demo12.java b/day03/src/com/inmind/circle06/Demo12.java
new file mode 100644
index 0000000..fba05a8
--- /dev/null
+++ b/day03/src/com/inmind/circle06/Demo12.java
@@ -0,0 +1,15 @@
+package com.inmind.circle06;
+/*
+循环的嵌套：外层循环执行一次，内层循环要执行一轮
+*/
+public class Demo12 {
+    public static void main(String[] args) {
+        //打印出一个500行500列的矩形的*
+        for (int i = 0; i < 3; i++) {//行
+            for (int j = 0; j < 2; j++) {//列
+                System.out.print("*");
+            }
+            System.out.println();
+        }
+    }
+}
diff --git a/day03/src/com/inmind/circle06/Test13.java b/day03/src/com/inmind/circle06/Test13.java
new file mode 100644
index 0000000..b001875
--- /dev/null
+++ b/day03/src/com/inmind/circle06/Test13.java
@@ -0,0 +1,15 @@
+package com.inmind.circle06;
+//使用循环的嵌套，实现时钟的效果（一天有0~23小时，每小时有0~59分）
+public class Test13 {
+    public static void main(String[] args) {
+        //一天有0~23小时，每小时有0~59分
+        //小时的循环
+        for (int hour = 0; hour < 24; hour++) {
+            for (int min = 0; min < 60; min++) {
+                System.out.println(hour+"时"+min+"分");
+            }
+        }
+
+        //尝试下99乘法表，注意内层循环就是外层循环的行号！！
+    }
+}