diff --git a/codes/kongjin/.keep b/codes/kongjin/.keep
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/codes/kongjin/xiaotiancai b/codes/kongjin/xiaotiancai
new file mode 100644
index 0000000000000000000000000000000000000000..396eee26b22a8def549a401b111002547a2e90bf
--- /dev/null
+++ b/codes/kongjin/xiaotiancai
@@ -0,0 +1,12 @@
+/**
+ * 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
+    ...
+    ...
+
+} //end
\ No newline at end of file