From 2852b5f178741765d9920c233b9ef004127b77d8 Mon Sep 17 00:00:00 2001
From: seahi <me@seahi.me>
Date: Mon, 9 Dec 2024 08:57:54 +0800
Subject: [PATCH] =?UTF-8?q?File=E5=9F=BA=E6=9C=AC=E6=93=8D=E4=BD=9C?=
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---
 src/chapter7/Example01.java | 58 +++++++++++++++++++++++++++++++++++++
 src/chapter7/Example03.java | 16 ++++++++++
 src/chapter7/Example04.java | 31 ++++++++++++++++++++
 3 files changed, 105 insertions(+)
 create mode 100644 src/chapter7/Example01.java
 create mode 100644 src/chapter7/Example03.java
 create mode 100644 src/chapter7/Example04.java

diff --git a/src/chapter7/Example01.java b/src/chapter7/Example01.java
new file mode 100644
index 0000000..f1d45f3
--- /dev/null
+++ b/src/chapter7/Example01.java
@@ -0,0 +1,58 @@
+package chapter7;
+
+import java.io.File;
+
+public class Example01 {
+    public static void main(String[] args) {
+        /**
+         * Step 1 创建普通文件
+         */
+        File file1 = new File("out/chapter7/file1.txt");
+        if (file1.exists()) {
+            // 如果文件存在就删除
+            System.out.println("文件file1.txt存在");
+            file1.delete();
+            System.out.println("文件file1.txt已删除");
+        } else {
+            // 如果文件不存在就创建
+            System.out.println("文件file1.txt不存在");
+
+            try {
+                file1.createNewFile();
+                System.out.println("文件file1.txt已创建");
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+
+        System.out.println("\n");
+
+        /**
+         * Step 2 创建目录
+         */
+        File parent = file1.getParentFile();
+        if (! parent.exists()) {
+            // 如果父目录不存在就创建
+            System.out.println("父目录不存在");
+            parent.mkdirs();
+            System.out.println("父目录已创建");
+        }
+
+        if (file1.exists()) {
+            // 如果文件存在就删除
+            System.out.println("文件存在");
+            file1.delete();
+            System.out.println("文件已删除");
+        } else {
+            // 如果文件不存在就创建
+            System.out.println("文件不存在");
+            try {
+                file1.createNewFile();
+                System.out.println("文件已创建");
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+
+    }
+}
diff --git a/src/chapter7/Example03.java b/src/chapter7/Example03.java
new file mode 100644
index 0000000..c3eeffd
--- /dev/null
+++ b/src/chapter7/Example03.java
@@ -0,0 +1,16 @@
+package chapter7;
+
+import java.io.File;
+
+public class Example03 {
+    public static void main(String[] args) {
+        File file = new File("src/chapter7");
+        if (file.isDirectory()) {
+            System.out.println("是目录");
+            String[] names = file.list();
+            for (String name : names) {
+                System.out.println(name);
+            }
+        }
+    }
+}
diff --git a/src/chapter7/Example04.java b/src/chapter7/Example04.java
new file mode 100644
index 0000000..bf8994f
--- /dev/null
+++ b/src/chapter7/Example04.java
@@ -0,0 +1,31 @@
+package chapter7;
+
+import java.io.File;
+import java.io.FilenameFilter;
+
+public class Example04 {
+    public static void main(String[] args) {
+        // 创建 File 对象
+        File file = new File("src/chapter7");
+        // 创建过滤器对象
+        FilenameFilter filter = new FilenameFilter() {
+            // 实现 accept 方法
+            @Override
+            public boolean accept(File dir, String name) {
+                File currFile = new File(dir, name);
+                if (currFile.isFile() && name.endsWith(".java")) {
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+        };
+
+        if (file.exists() && file.isDirectory()) {
+            String[] names = file.list(filter);
+            for (String name : names) {
+                System.out.println(name);
+            }
+        }
+    }
+}