diff --git a/day03/src/com/inmind/Demo_Die.java b/day03/src/com/inmind/Demo_Die.java
new file mode 100644
index 0000000..b117c24
--- /dev/null
+++ b/day03/src/com/inmind/Demo_Die.java
@@ -0,0 +1,24 @@
+package com.inmind;
+/*
+死循环：循环条件永远满足时，不断执行循环体。
+
+注意：死循环的后面不允许添加任何代码，因为永远都不会执行，编译器就直接报错
+*/
+public class Demo_Die {
+    public static void main(String[] args) {
+        //while死循环
+        int i = 0;
+        while(true){
+            i++;
+            if (i == 1000) {
+                break;
+            }
+        }
+        //-----------------------------------
+        System.out.println("程序结束");
+        //for死循环
+        for(;;){
+        }
+
+    }
+}
diff --git a/day03/src/com/inmind/Demo_xunhuans.java b/day03/src/com/inmind/Demo_xunhuans.java
new file mode 100644
index 0000000..f7a41a2
--- /dev/null
+++ b/day03/src/com/inmind/Demo_xunhuans.java
@@ -0,0 +1,14 @@
+package com.inmind;
+//循环的嵌套
+public class Demo_xunhuans {
+    public static void main(String[] args) {
+        //打印一个5行每行5个*的矩形
+        System.out.print("*");
+        System.out.print("*");
+        System.out.print("*");
+        System.out.print("*");
+        System.out.println("*");
+        System.out.println("*");
+        System.out.println("*");
+    }
+}