diff --git a/day03/src/com/inmind/break06/Demo12.java b/day03/src/com/inmind/break06/Demo12.java
new file mode 100644
index 0000000..265f2a5
--- /dev/null
+++ b/day03/src/com/inmind/break06/Demo12.java
@@ -0,0 +1,23 @@
+package com.inmind.break06;
+/*
+死循环：循环条件永远满足true
+如何结束死循环：break
+*/
+public class Demo12 {
+    public static void main(String[] args) {
+        //最常见的死循环
+        /*while (true) {
+        }*/
+
+        //for的死循环
+        /*for(;;){
+        }*/
+
+        //do-while的死循环
+        do{
+            System.out.println(3);
+        }while(true);
+
+//        System.out.println("程序结束");
+    }
+}