diff --git a/javaSE-day05/src/com/inmind/thread07/Demo01.java b/javaSE-day05/src/com/inmind/thread07/Demo01.java
new file mode 100644
index 0000000..6de4916
--- /dev/null
+++ b/javaSE-day05/src/com/inmind/thread07/Demo01.java
@@ -0,0 +1,20 @@
+package com.inmind.thread07;
+/*
+java程序中的主线程
+
+总结：
+    java程序运行就是一个进程，它必定有一个线程来执行任务，该线程叫主线程(main),它的任务是执行主方法
+ */
+public class Demo01 {
+    public static void main(String[] args) {
+        //打印1000次hello java
+        for (int i = 0; i < 100; i++) {
+            System.out.println("hellojava");
+        }
+        System.out.println("-----------------");
+        //打印1000次hello python
+        for (int i = 0; i < 100; i++) {
+            System.out.println("hello python");
+        }
+    }
+}