diff --git a/codes/TechOS/techos.java b/codes/TechOS/techos.java
new file mode 100644
index 0000000000000000000000000000000000000000..f25fc8aa4b12957abb22c66b521a19434419a41c
--- /dev/null
+++ b/codes/TechOS/techos.java
@@ -0,0 +1,23 @@
+/**
+ * 冒泡排序函数
+ * aa bb cc
+ * @param a 待排序的数组
+ * @param n 待排序的数组长度
+ */
+public static void bubbleSort(int [] a, int n){
+
+    // 你的代码，使无序数组 a 变得有序
+    
+    for(int i = 0; i < n-1; i++){
+	   for(int j = 0; j < n - 1; j++){
+		   if(a[j] > a[j+1]){
+			   int temp = a[j];
+			   a[j] = a[j+1];
+			   a[j+1] = temp;
+		   }
+	   }
+    }
+    ...
+    ...
+
+} //end