Byte stream write input

Three ways of byte stream writing input

import java.io.*;


public class file_demo01 {
    
    public static void main(String[] args) throws IOException {
    
        // Create byte output stream object 
        //FileOutputStream(String name) Create a file output stream to write to the file with the specified name 
        FileOutputStream fos = new FileOutputStream("demo1/javase/j3.txt");
        // If there is no such document , In fact, one will also be created j3.txt
        /* 1. Call the system function to create a file  2. Create byte output stream object  3. Let the byte output stream object point to the created file  * */
        //1.void write (int b); Writes the specified bytes to the output stream of this file 
// fos.write(99);// Here is ascll code 
        //2.void write(byte[] b);
// byte[] by = {97,98,99,100};
// fos.write(by);
        //byte[] getBytes()  Returns the byte array corresponding to the string 
        byte[] bytes="His faliure in the exam is attributable to his laziness".getBytes();
        //3.void write(byte[] b, int off ,int len) take len Bytes from the specified off Position start , write in file The file of 
        fos.write(bytes,5,10);//offset In fact, it can be understood as subscript 
        fos.close();
    }
}

import java.io.*;


public class file_demo01 {
    
    public static void main(String[] args) throws IOException {
    
    /* * 1. How to correctly realize line feed when writing data in byte stream ？ * fos.write("\n".getBytes()); * 2. How to append byte stream write data ？ *public FileOutputStream(String name, boolean append) *  If the second parameter is true, Write the beginning of the byte to the end of the file instead of , In this way, we can add  * */
        FileOutputStream fos = new FileOutputStream("demo1/javase/j1.txt",true);
        for (int i=0;i<=10;i++){
    
            byte[] bytes = "yes,i do".getBytes();
            fos.write(bytes);
            fos.write("\n".getBytes());
        }
        fos.close();
    }
}

import java.io.*;


public class file_demo01 {
    
    public static void main(String[] args)  {
    
        /* Byte stream write data and exception handling  * finally ： Provide... In exception handling finally Block to perform all cleanup operations , for instance IO Free resources in the stream  *  Because when an exception is caught , Just jumped out of the program , As a result, subsequent cleanup operations do not release resources , Therefore use finally To enforce  *  characteristic ： stay finally The control statement must be executed , Unless JVM sign out  * */
        FileOutputStream fos = null;
        try {
    
            fos = new FileOutputStream("demo1/javase/j1.txt");
            fos.write("yes".getBytes());
        }catch (IOException e){
    
            e.printStackTrace();
        }finally{
    
            if (fos !=null){
    // Preventing root creation fails , here fos=null
                try {
    
                    fos.close();
                } catch (IOException e) {
    
                    e.printStackTrace();
                }
            }
        }
    }
}