From 5f3a7ef34740e92b065a85a51fdffcbce681342d Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 21 Mar 2026 11:20:17 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day09-=E6=96=87=E4=BB=B6?=
 =?UTF-8?q?=E7=9A=84=E7=BB=AD=E5=86=99=E5=92=8C=E6=8D=A2=E8=A1=8C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../inmind/io01/{Demo4.java => Demo04.java}   |  2 +-
 javaSE-day09/src/com/inmind/io01/Demo05.java  | 33 +++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)
 rename javaSE-day09/src/com/inmind/io01/{Demo4.java => Demo04.java} (98%)
 create mode 100644 javaSE-day09/src/com/inmind/io01/Demo05.java

diff --git a/javaSE-day09/src/com/inmind/io01/Demo4.java b/javaSE-day09/src/com/inmind/io01/Demo04.java
similarity index 98%
rename from javaSE-day09/src/com/inmind/io01/Demo4.java
rename to javaSE-day09/src/com/inmind/io01/Demo04.java
index 041f387..22039a4 100644
--- a/javaSE-day09/src/com/inmind/io01/Demo4.java
+++ b/javaSE-day09/src/com/inmind/io01/Demo04.java
@@ -15,7 +15,7 @@ import java.util.Arrays;
         1.UTF-8:字母和数字都只占1个字节,而一个中文占3个字节
         2.GBK:字母和数字都只占1个字节,而一个中文占2个字节
  */
-public class Demo4 {
+public class Demo04 {
     public static void main(String[] args) {
         String str = "abc";
         //字符串--->字节数组
diff --git a/javaSE-day09/src/com/inmind/io01/Demo05.java b/javaSE-day09/src/com/inmind/io01/Demo05.java
new file mode 100644
index 0000000..32961c2
--- /dev/null
+++ b/javaSE-day09/src/com/inmind/io01/Demo05.java
@@ -0,0 +1,33 @@
+package com.inmind.io01;
+
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+/*
+文件的续写并写出字节数组
+    续写:默认会将原本文件中的数据覆盖,但是我们想继续拼接输入
+    续写就是使用重载的构造方法即可,true:续写  false:覆盖
+        FileOutputStream(String name, boolean append) 创建文件输出流以指定的名称写入文件。
+    写出字节数组
+        void write(byte[] b) 将 b.length字节从指定的字节数组写入此文件输出流。
+        void write(byte[] b, int off, int len) 将 len字节从指定的字节数组开始，从偏移量 off开始写入此文件输出流。
+  ----------------------------------------------------------------------------------
+  文件内容的换行
+  windows：\r\n
+  linux: \n
+  mac: \r
+
+ */
+public class Demo05 {
+    public static void main(String[] args) throws IOException {
+        FileOutputStream fos = new FileOutputStream("a.txt", true);
+
+//        fos.write("我是谁，我在哪，我在干嘛".getBytes());
+//        fos.write("我是谁我在哪我在干嘛".getBytes(),0,9);
+//        fos.write("我是谁\r\n我在哪\r\n我在干嘛".getBytes());
+        fos.write(("我是谁"+System.lineSeparator()+"我在哪我在干嘛").getBytes());
+
+        fos.close();
+    }
+}