diff --git a/s-day08/src/com/inmind/digui02/Test12.java b/s-day08/src/com/inmind/digui02/Test12.java
new file mode 100644
index 0000000..1adfdb1
--- /dev/null
+++ b/s-day08/src/com/inmind/digui02/Test12.java
@@ -0,0 +1,31 @@
+package com.inmind.digui02;
+
+import java.io.File;
+
+/*
+练习_打印指定目录下所有的txt文件
+ */
+public class Test12 {
+    public static void main(String[] args) {
+        File file = new File("D:\\io_test");
+        getFiles(file);
+    }
+
+    public static void getFiles(File file) {
+        if (file.isFile()) {
+            return;//文件就不用遍历
+        }
+        File[] files = file.listFiles();
+        for (File f : files) {
+            if (f.isDirectory()) {
+                getFiles(f);
+            } else {
+                //文件判断
+                String name = f.getName();
+                if (name.endsWith(".txt")) {
+                    System.out.println(f.getName());
+                }
+            }
+        }
+    }
+}