Java基础知识强化之IO流笔记19：FileOutputStream的三个write方法

1. FileOutputStream的三个write方法：

`void`	`write(byte[] buffer)` Writes the entire contents of the byte array `buffer` to this stream.
`void`	`write(byte[] buffer, int offset, int count)` Writes `count` bytes from the byte array `buffer` starting at `offset` to this stream.
`void`	`write(int oneByte)` Writes the specified byte `oneByte` to this stream.

2. 代码示例：

 1 package com.himi.fileoutputstream;
 2 
 3 import java.io.FileNotFoundException;
 4 import java.io.FileOutputStream;
 5 import java.io.IOException;
 6 
 7 /**
 8  * 
 9  *字节输出流操作步骤：
10  *        第一步：创建字节输出流对象
11  *        第二步：写数据
12  *        第三步：关闭字节输出流对象
13  *
14  *  void    write(byte[] buffer) 
15  *         Writes the entire contents of the byte array buffer to this stream.
16  *         
17  *    void    write(byte[] buffer, int offset, int count) 
18  *         Writes count bytes from the byte array buffer starting at offset to this stream.
19  *         
20  *  void    write(int oneByte) 
21  *         Writes the specified byte oneByte to this stream.
22  *
23  *
24  */
25 
26 
27 public class FileOutputStreamDemo2 {
28 
29     public static void main(String[] args) throws IOException{
30         //创建字节输出流对象
31         FileOutputStream fos = new FileOutputStream("fos2.txt");
32         
33         //写数据
34         //write(int oneByte) 97---底层二进制数据--通过记事本打开--找到97对应的字符值--a
35         
36         for (int i = 97; i < 110; i++) {
37             fos.write(i);
38         }
39         
40         
41         //写数据
42         //write(byte[] buffer)  写一个字节数组 ，对应也是字符
43         byte[] bytes = {111,112,113,114,115};
44         fos.write(bytes);
45         
46         //写数据
47         //write(byte[] buffer, int offset, int count) 写一个字节数组的一部分
48         fos.write(bytes, 1, 3);
49         
50     
51 
52     }
53 
54 }