From 81b0a7d524e49293ade63fb5c89040b5f8f31b6b Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sun, 9 Aug 2026 15:14:27 +0800
Subject: [PATCH] =?UTF-8?q?s-day08-=E8=BF=87=E6=BB=A4=E5=99=A8=E4=BC=98?=
 =?UTF-8?q?=E5=8C=96=E4=B9=8B=E5=89=8D=E7=9A=84=E7=BB=83=E4=B9=A0=E9=97=AE?=
 =?UTF-8?q?=E9=A2=98(lambda)?=
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---
 s-day08/src/com/inmind/digui02/Test12.java | 43 +++++++++++++++++++++-
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/s-day08/src/com/inmind/digui02/Test12.java b/s-day08/src/com/inmind/digui02/Test12.java
index 1adfdb1..acdfdff 100644
--- a/s-day08/src/com/inmind/digui02/Test12.java
+++ b/s-day08/src/com/inmind/digui02/Test12.java
@@ -1,6 +1,7 @@
 package com.inmind.digui02;
 
 import java.io.File;
+import java.io.FileFilter;
 
 /*
 练习_打印指定目录下所有的txt文件
@@ -8,14 +9,52 @@ import java.io.File;
 public class Test12 {
     public static void main(String[] args) {
         File file = new File("D:\\io_test");
-        getFiles(file);
+//        getFiles(file);
+//        getFilesByFilter(file);
+        lambdaFilesByFilter(file);
     }
 
+    public static void lambdaFilesByFilter(File file) {
+        if (file.isFile()) {
+            return;//文件就不用遍历
+        }
+        File[] files = file.listFiles(f->f.isDirectory()||(f.isFile()&&f.getName().endsWith(".txt")));//在此处使用文件过滤器来优化代码，将子内容中文件夹或者txt文件保留即可
+        for (File f : files) {
+            if (f.isDirectory()) {
+                getFiles(f);
+            } else {
+                System.out.println(f.getName());
+            }
+        }
+    }
+
+
+    public static void getFilesByFilter(File file) {
+        if (file.isFile()) {
+            return;//文件就不用遍历
+        }
+        File[] files = file.listFiles(new FileFilter() {
+            @Override
+            public boolean accept(File f) {
+                return f.isDirectory()||(f.isFile()&&f.getName().endsWith(".txt"));
+            }
+        });//在此处使用文件过滤器来优化代码，将子内容中文件夹或者txt文件保留即可
+        for (File f : files) {
+            if (f.isDirectory()) {
+                getFiles(f);
+            } else {
+                System.out.println(f.getName());
+            }
+        }
+    }
+
+
+
     public static void getFiles(File file) {
         if (file.isFile()) {
             return;//文件就不用遍历
         }
-        File[] files = file.listFiles();
+        File[] files = file.listFiles();//在此处使用文件过滤器来优化代码，将子内容中文件夹或者txt文件保留即可
         for (File f : files) {
             if (f.isDirectory()) {
                 getFiles(f);